Daiber, F.C. (1960)
Notes on the biology of the butterfly rays, Gymnura altavela and Gymnura micrura. Copeia, 1960(2), 137–139
DOI: 10.2307/1440209

Daiber, F.C. (1960)
A Technique for Age Determination in the Skate, Raja eglanteria. Copeia, 1960(3), 258–260
DOI: 10.2307/1439680