List of the studied authors
Kovalev & Shmeleva, 1982 (p.86); Greze & al., 1985 (p.8); Böttger-Schnack, 1994 (p.277); 1996 (p.1086); Uysal & al., 2002 (p.18, tab.1); Nishibe & Ikeda, 2004 (p.931, Tab. 2, 4, 5); Nishibe & al., 2009 (p.491, Table 1: seasonal abundance);