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 R. S.  Ostfeld and E. J.  Heske, ?Sexual dimorphism and mating systems in voles?, J. Mammal, vol. 74, p. 230-233, 1993.\par \par  E. J.  Heske and R. S.  Ostfeld, ?Sexual dimorphism in size, relative size of testes, and mating systems of North American voles?, J. Mammal, vol. 71, p. 510-519, 1990.\par \par }