List of the studied authors
Sewell, 1948 (p.328, 531, 534, 539, 540, 541, 542); Grice & Hulsemann, 1967 (p.17); Park, 1983 (p.198, 199); Bradford & al., 1983 (p.115); Madhupratap & Haridas, 1986 (p.105, tab.1); 1990 (p.305, fig.5: vertical distribution night/day; fig.7: cluster); Gopalakrishnan & Balachandran, 1992 (p.167, figs.1, 6, Table 1, 2);