1. Breder, C. M. Bull. Am. Mus. nat. Hist. 117, 397–481 (1959); Zoologica 52, 25–40 (1967).
2. Cushing, D. H. & Harden Jones, F. R. Nature 281, 918–920 (1968).
3. Breder, C. M. Zoologica 50, 97–114 (1965).
4. Belyayev, N. & Zuyev, G. V. J. Ichthyol. 9, 589–594 (1969).
5. Weihs, D. Nature 241, 290–291 (1973).