Demografski osnovi na sot͡s︡ialnoto osiguri͡a︡vane
By: Petŭr Penkov.
Publisher: Nauch-izsledovatelski in-t po profsŭi͡u︡zni problemi "G. Dimitrov," pri T͡S︡S na BPS
Published: 1980
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 201
Subjects: Demography -- Methodology.; Vital statistics.; Social security.
Notes: Bibliography: p. 198-200.