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  1. By: Lazarov, Stoyan
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 9
    Date: 1998
    Page Range: 27--34
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  2. By: Lazarov, Stoyan - Naumova, Maria
    Type: Article
    In: Revue suisse de zoologie
    Volume: 117
    Date: 2010
    Page Range: 101--110
    Publication Info: Genève, Kundig [etc.],