<PAGE>   1
                                                                   EXHIBIT 10.24
                          PURCHASE CONTRACT #250400/00k

Moscow                                                          April 25, 2000

Limited Liability Company "Sparrk" represented by its Director General Barkov
S.A. acting on the basis of the Bylaws, hereinafter referred to as the Seller,
on the one hand, and Close Joint-Stock Company "OXIRIS", hereinafter referred to
as the Buyer, represented by Dolgov V.A. acting on the basis of the Bylaws, on
the other, have signed the present Contract as follows:

                           1. SUBJECT OF THE CONTRACT

1.1. The Seller shall transfer and the Buyer shall pay for the Goods (books)
     specified in the Seller's price list in accordance with the present
     Contract.
1.2. The transfer of the Goods shall be effected upon the Buyer's oral or
     written request. The amount and assortment of the Goods are indicated in
     waybills enclosed to every consignment of the Goods.

                             2. PRICE OF THE GOODS

2.1. The price for the Goods is fixed in Russian rubles and determined by the
     Seller's price list.
2.2. The price for the Goods is specified in invoices and waybills enclosed to
     every consignment of the Goods.
2.3. The price of the Goods includes the cost of the Goods and packing.

                    3. RIGHTS AND OBLIGATIONS OF THE PARTIES

3.1. The Seller shall:
       3.1.1. provide the Buyer with the Goods of the proper quality conforming
              to certificates, other technical documents and sanitary norms and
              regulations if the Goods in question are available at the Seller's
              warehouse against an order placed by the Buyer within 24 hours of
              the order receipt.
       3.1.2. replace substandard goods within 5 (five) days of the notification
              of the same. Goods are considered to be substandard if they bear
              apparent or latent defects or have been rejected by third parties
              due to defects emerged through the Seller's fault which were not
              mentioned at the transfer or if their content does not meet the
              requirements of the current legislation.
       3.1.3. if the Goods are not available at the Seller's warehouse, inform
              the Buyer of a possible delivery date within 24 hours.
       3.1.4. draw up ... documents.
       3.1.5. extend the quality guarantee for the Goods in the framework of the
              manufacturer's guarantees.
       3.1.6. once a week notify the Buyer by e-mail of the availability of the
              Goods at the Seller's warehouse according to the Sellers' price
              list.
3.2. The Buyer shall:
       3.2.1. transfer the Goods from the Seller's warehouse in Moscow at his
              own account.
       3.2.2. during the transfer of the Goods, check their quantity and
              assortment, draw up the appropriate documents, notify the Seller
              of any defects detected during the transfer. The Buyer has the
              right to reject the Goods if do not conform to the requested
              assortment or quantity.

                   4. PRICE OF THE GOODS AND TERMS OF PAYMENT
<PAGE>   2


4.1. The price of a consignment of the Goods is fixed in rubles and equals the
     number of units of certain Goods multiplied by their price according to
     item 2.1.
4.2. The payment date is a date when the funds are entered to the Seller's
     settlement account.
4.3. The Buyer pays for the Goods by the transfer of money to the Seller's
     settlement account according to the request and invoice not later than 20
     days from the date the Goods are received.
4.4. Provided that it is agreed upon, the parties can pay cash in accordance
     with the RF legislation.

                        5. RESPONSIBILITY OF THE PARTIES

5.1. If any of the parties does not observe any provision hereof, the disputes
     shall be settled by means of mutual agreements. If the parties do not come
     to an agreement, the matter is to be submitted for settlement to the
     International Arbitration Court attached to Moscow Chamber of Commerce and
     Industry.

                 6. TERM OF VALIDITY AND CANCELLATION PROCEDURE

6.1. The Contract takes effect from the moment of its signing by the parties'
     authorized representatives.
6.2. The validity term of the present Contract is one calendar year. Upon its
     expiration the Contact term is automatically extended for every subsequent
     term unless either of the parties has notified the other in writing before
     the expiration date of the Contract cancellation or revision.
6.3. The present Contract may be cancelled according to the will of either of
     the parties upon written notification to the other party not later than a
     month before the Contract cancellation moment.

                                7. FORCE-MAJEURE

7.1. In the occurrence of circumstances of force-majeure caused directly or
     indirectly by such factors as flood, fire, earthquake, epidemics,
     hostilities, military upheaval, terrorist acts, civil disturbances,
     strikes, instructions, orders or other administrative interference on
     behalf of the government or other resolutions, administrative or
     governmental restrictions affecting the execution of the obligations
     hereof, or other circumstances beyond the parties' reasonable control, the
     time of the fulfillment of the Contract obligations is extended for the
     period during which such circumstances last, if they have a considerable
     effect on a timely execution of the whole Contract of the part of it which
     is subject to execution after the occurence of force-majeure. Both parties
     should immediately notify each other in writing of the beginning and
     cessation of the force-majeure circumstances which hamper the execution of
     the Conract obligations. The Party referring to the force-majeure
     circumstances is obliged to prove this by a document issued by a relevant
     state authority.

                         8. OTHER TERMS AND CONDITIONS

8.1. The Contract may be altered or amended by the parties' written agreement
     signed by the parties' authorized representatives.
8.2. The parties agree to keep the Contract conditions and any information
     concerning the other party's activities connected with the present Contract
     strictly confidential and not to make any public statements regarding these
     conditions unless a written consent of the other party is received.
8.3. The present Contract along with the Annexes shall substitute for any prior
     arrangements, regulations, written and oral agreements relating to the
     subject hereof.
<PAGE>   3


8.4. Within two working days of the date of signing hereof, the parties present
     their employees (one person from both parties) in charge of organizing
     technical interaction to exchange data between the information systems of
     the Buyer and the Seller.
8.5. Within a fortnight of the date of the signing hereof the Party's working
     groups under the direction of the employees in charge agree upon all
     details of technical interaction to exchange information concerning the
     Goods and draw up a Protocol of information exchange and update procedure
     which is ratified by the parties' authorized representatives being an
     integral part hereof.

                    9. ADDRESSES PARTICULARS OF THE PARTIES

<TABLE>
<CAPTION>
THE SELLER                                                              THE BUYER
<S>                                                           <C>
Full name of the organization:                                 Full name of the organization:
LLC<<Sparrk>>                                                  Close Joint-Stock Company<<OXIRIS>>
Legal address: 4, bld. 1 Marshala                              Legal address: 12 Nauchnyi Proezd,
Novikova Str., 123098 Moscow                                   117802 Moscow
Phone: 196-0719, 196-0828                                      Phone: (095) 334-4411
Fax: 196-0719                                                  Fax: (095) 937-5060
Name of the bank: Moscow Bank of                               Name of the bank: Joint-Stock
Joint-Stock Commercial Savings Bank of                         Commercial Bank <<Evrozapsibbank>>
the RF, Department Tushinskoye                                 Settlement account:
7973/01628                                                     40702810700030000049
Settlement account:                                            BIC: 044585726
40702810038210101289                                           Correspondent
BIC: 044525342                                                 account:30101810000000000726
Correspondent account:                                         TIN: 7706200205
30101810600000000342                                           OKONH: 71100, 71200
TIN: 7733054994                                                OKPO: 51260913
OKONH                                                          Director General of Close Joint-Stock
OKPO                                                           Company<<OXIRIS>>
Director General of LLC<<Sparrk>>                              Signature
Signature                                                      Dolgov V.A.
Barkov S.A.                                                    Seal
Seal
April 25, 2000
e-mail: sparrk@cityline.ru
</TABLE>

<PAGE>   4

            PROTOCOL TO CONTRACT #______OF <<____>>_____________2000

              TECHNICAL SPECIFICATION OF THE PROVIDED INFORMATION

1. Format of the provided data (database type): Excel, dbf
2. Format of the transferred information update: Excel, dbf
3. Method of information update transfer: through e-mail
4. General information about the goods:
       4.1.  [ ] Title of the product in Russian
       4.2.  [ ] Title of the product in English
       4.3.  [X] Author's (authors') name (-s) in Russian
       4.4.  [ ] Author's (authors') name (-s) in English
       4.5.  [ ] Language of the original
       4.6.  [ ] Author of the translation
       4.7.  [X] Year of issue
       4.8.  [X] Publishing house, city
       4.9.  [X] Number of pages
       4.10. [ ] Type of cover
       4.11. [ ] BBK
       4.12. [ ] UDK
       4.13. [X] ISBN
       4.14. [ ] Overall dimensions
       4.15. [ ] Weight
       4.16. [ ] Annotation
5. Commercial information about the goods:
       5.1.  [X] Price of the goods
       5.2.  [ ] Availability at the warehouse




THE SELLER                                  THE BUYER
Director General                            Dolgov V.A.
LLC<<Sparrk>>                               Signature
Barkov S.A.                                 Seal
Signature
Seal