Otbranitelni sŭorŭzhenii͡a︡ v bŭlgarskoto srednovekovie
By: Margarita A. Kharbova.
Publisher: Dŭrzh. izd-vo "Tekhnika,"
Published: 1981
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 211
Subjects: Fortification -- Bulgaria -- History.
Notes: Bibliography: p. 200-203.
Summary in English, German, and Russian.