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1by Sto︠i︡anov, Nikolaĭ, b. 1883
Published 1921Sofi︠i︡a : Pechatni︠t︡sa "Khudozhnik", 1921.244 p. ; 20 cm. -
2Sofii︠a︡, Bŭlgarska akademii︠a︡ na naukite, Botanicheski institut.v. ill. 25 cm.“...Bulletin de l'Institut botanique....”