Wesley R. Strong, Jr., Franklin F. Snelson, Jr., Samuel H. Gruber, Hammerhead Shark Predation on Stingrays: An Observation of Prey Handling by Sphyrna mokarran, Copeia, Vol. 1990, No. 3 (Sep. 19, 1990), pp. 836-840
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Strong et al. (1990) studied this question.