A. Stanley Rand

Sexual selection for sensory exploitation in the frog Physalaemus pustulosus

M. Ryan, A. S. Rand, W. Wilczynski, 1990, Nature.

GEOGRAPHIC VARIATION OF GENETIC AND BEHAVIORAL TRAITS IN NORTHERN AND SOUTHERN TÚNGARA FROGS

M. Ryan, U. Mueller, H. Pröhl, 2006, Evolution; international journal of organic evolution.