Richard Ostfeld

Sexual dimorphism in size, relative size of testes, and mating systems of North American voles
Heske, E. J., and Richard S. Ostfeld. 1990. “Sexual Dimorphism in Size, Relative Size of Testes, and Mating Systems of North American Voles”. J. Mammal 71: 510-19.
The ecology of territoriality in small mammals
Ostfeld, Richard S. 1990. “The Ecology of Territoriality in Small Mammals”. Trends Ecol. Evol. 5: 411-15.
Microtine social systems, adaptation, and the comparative method
Ostfeld, Richard S., and L.L. Klosterman. 1990. “Microtine Social Systems, Adaptation, and the Comparative Method”. In R. H. Tamarin, R. S. Ostfeld, S. R. Pugh, and G. Bujalska (eds.), 35-44. Social Systems and Population Cycles in Voles. Birhauser-Verlag AG, Basel, Switzerland.