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  1. 1
    Published 1948
    Sofia : Presses de l'Académie des sciences, 1948-
    v. : ill. ; 23 cm.
  2. 2
  3. 3
    Sofi︠i︡a : Izd. na Bŭlgarskata akademi︠i︡a na naukite,
    v. : ill., ports.
  4. 4
    Sofi︠i︡a : Bŭlgarsko prirodoizpitatelno druzhestvo,
    v. : ill. ; 30 cm.
  5. 5
    Sofia, Izd-vo na Bŭlgarskata akademi︠i︡a na naukite.
    v. ill. 25 cm.
  6. 6
    Published 1974
    Sofi︠i︡a : Vissh mashinno-elektrotekhnicheski institut "V.I. Lenin," 1974.
    96 p. : ill. ; 24 cm.
  7. 7
    Plovdiv : Universitet,
    v. : ill.
  8. 8
    Published 1976
    Sofi︠i︡a : BAN, 1976 [dep. 1978]
    194 p. : diagrs. ; 20 cm.

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