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Scientific legacy of the distinguished Bulgarian statistician, economist and public man - academician Ivan Stefanov (110th anniversary of his birth)
Nikolova, Nadežda I., (2009)
Otraslovata struktura i mežduotraslovite vrŭzki na promišlenostta v NR Bŭlgarija : Bŭlg. Akad. na naukite. Ikonom. Inst.
Šapkarev, Petǔr, (1965)
Vŭprosi na razvitieto na elektrifikacijata v NR Bŭlgarija : Bŭlg. Akad. na naukite. Ikonom. Inst.
Šapkarev, Petǔr, (1963)