Young-Bae Chung, Yoon Kong, Il-Jung Joo, Seung-Yull Cho, Shin-Yong Kang, Excystment of Paragonimus westermani Metacercariae by Endogenous Cysteine Protease, The Journal of Parasitology, Vol. 81, No. 2 (Apr., 1995), pp. 137-142
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Chung et al. (1995) studied this question.