Thure E. Cerlinga

Digestion and passage rates of grass hays by llamas, alpacas, goats, rabbits, and horses

J. Ehleringer, L. Ayliffe, B. Passey, 2003 .

Reaearch paperA 16-Ma record of paleodiet using carbon and oxygen isotopes in fossil teeth from Pakistan

A. Chivas, D. Pilbeam, J. Barry, 1992 .