Fiziko-matematicheska i tekhnicheska ent͡s︡iklopedii͡a︡
By: [glaven redaktor Boi͡a︡n Petkachin].
Contributors: Petkachin, Boi͡a︡n.
Publisher: Izd-vo na Bŭlgarskata akademii͡a︡ na naukite
Published: 1990
Place of publication: Sofii͡a︡
Language: bul
Subjects: Physics -- Encyclopedias.; Mathematics -- Encyclopedias.; Engineering -- Encyclopedias.
Notes: At head of title, v. 1-   : Bŭlgarska akademii͡a︡ na naukite. Bŭlgarska ent͡s︡iklopedii͡a︡.
Errata slip inserted.