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  1. By: Ivanova, Teodora - Stoev, Pavel - Petrov, Boyan
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 5
    Date: 1995
    Page Range: 35--36
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  2. By: Petrov, Boyan
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 11
    Date: 2000
    Page Range: 61--64
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  3. By: Petrov, Boyan - Hristova, Svetlana - Hristov, Hristo
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 15
    Date: 2002
    Page Range: 143--146
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-