Iz opita na plovdivskite matematit͡s︡i.
Publisher: Sŭi͡u︡z na matematit͡s︡ite v Bolgarii͡a︡, sekt͡s︡ii͡a︡ Plovdiv
Published: 1980
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 83