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East-West relations in change : some implications of the Western aid regime for the political economy and ecology in Poland and Bulgaria 1989 - 1992
Baumgartl, Bernd, (1993)
Săvremeni problem na partijnoto răkovodstvo na ikonomikata
Vălkov, Ilija, (1982)
Socialʹno-ėkonomičeskaja politika v NRB
Rudakov, Evgenij V., (1985)