James B. Murphy, William E. Lamoreaux, Charles C. Carpenter, Threatening Behavior in the Angle-Headed Dragon, Goniocephalus dilophus (Reptilia, Lacertilia, Agamidae), Journal of Herpetology, Vol. 12, No. 4 (Oct. 30, 1978), pp. 455-460
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Murphy et al. (1978) studied this question.
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