Mathews, C.P. (1975)
Some observations on the ecology of Galeus piperatus Springer and Wagner, a little known shark endemic to the Northern Gulf of California. Journal of Fish Biology, 7(1), 77–82
DOI: 10.1111/j.1095-8649.1975.tb04577.x

Mathews, C.P. (1975)
Note on the ecology of the ratfish Hydrolagus colliei in the Gulf of California, Mexico. California Fish and Game, 61(1), 47–53

Mathews, C.P. & González, J.D. (1975)
Potencial pequero y esudios ecologicos de Bahia Magdalena III. Las existencias de rayas con especial interes a las ya aprovechadas. Ciencias Marinas, 2(1), 67–72

Mathews, C.P. & Ruiz, D.M.F. (1974)
Cephalurus cephalus, a small shark, taken in the northern Gulf of California, with a description. Copeia, 1974(2), 556–560