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G. A. Conder and S. S. Johnson. (1996). Viability of Infective Larvae of Haemonchus contortus, Ostertagia ostertagi, and Trichostrongylus colubriformis Following Exsheathment by Various Techniques. The Journal of Parasitology, 82(1), 100–102. doi:10.2307/3284123 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research