Hat mitgewirkt an:
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Spravočnik / Bolgarskaja Akademija Nauk
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Bibliologija, razvitie, obščestvo : Meždunarodna Konferencija po Bibliologija, Sofija, 4 - 7 oktomvri 1988 = Bibliologie, developpement, societe
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Mathematical logic and its applications : [proceedings of an Advanced International Summer School and Conference on Mathematical Logic and Its Applications, in honor of the 80th anniversary of Kurt...
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Kamenna plastika