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  1. By: Spassov, Nikolaï
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 12
    Date: 2000
    Page Range: 89--128
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  2. By: Spassov, Nikolaï
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 7
    Date: 1997
    Page Range: 109--113
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  3. By: Spassov, Nikolaï - Koufos, George D
    Type: Article
    In: Mitteilungen der Bayerischen Staatssammlung für Paläontologie und Histor. Geologie
    Volume: 42
    Date: 2002
    Page Range: 83--101
    Publication Info: München, Bayerische Staatssammlung für Paläontologie und Historische Geologie,
  4. By: Spassov, Nikolaï - Raychev, Dimitar
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 7
    Date: 1997
    Page Range: 71--96
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  5. By: Spassov, Nikolaï
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 9
    Date: 1998
    Page Range: 101--113
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  6. By: Spassov, Nikolaï
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 2
    Date: 1990
    Page Range: 64--66
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  7. By: Spassov, Nikolaï
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 2
    Date: 1990
    Page Range: 61--63
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  8. By: Markov, Georgi - Spassov, Nikolaï - Simeonovski, Velizar
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 14
    Date: 2002
    Page Range: 141--144
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-
  9. 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-
  10. 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-
  11. By: Spassov, Nikolaï - Simeonovski, Velizar - Spiridonov, Geko
    Type: Article
    In: Historia naturalis bulgarica
    Volume: 8
    Date: 1997
    Page Range: 101--120
    Publication Info: Sofiia, Bulgarska akademiia na naukite, c1989-