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Annual cycles in plasma testosterone and thyroxine in the male aspic viper Vipera aspis L., (Reptilia, Viperidae), in relation to the sexual cycle and hibernation

BiologyReproduction ResponseNatural SciencesEvolutionary BiologyPhysiologyMale AspicVipera Aspis L.EndocrinologyMedicineSexual CycleReproductive HormoneReproductive Endocrinology