1. M. M. Coelho (1983 ). The straight mouth Portuguese Chondrostoma Agassiz, 1835. I-On the populations of Ch. polylepis Steindachner, 1865 (Pisces, Cyprinidae). Arq. Mus. Bocage.
2. M. J. Collares-Pereira (in press). The Portuguese populations of some Cyprinid genera (Chondrostoma, Pseudophoxinus and Rutilus). Folia Vertebrata, Madrid.