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  1. By: Spassov, Nikolaï - Ivanova, Nevena - Georgiev, Kiril - Ivanov, Vasil
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 14
    Date: 2002
    Page Range: 123--140
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  2. By: Spassov, Nikolaï - Georgiev, Kiril - Ivanov, Vasil - Stoev, Pavel
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 10
    Date: 1999
    Page Range: 133--146
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-