Comparative study on free-running locomotor activity circadian rhythms in Brazilian subterranean fishes with different degrees of specialization to the hypogean life (Teleostei: Siluriformes; Characiformes) - Trajano, Eleonora; Carvalho, M. R.; Duarte, L.; Menna Barreto, Luiz Silveira (Biological Rhythm Research, 2009)