Rigbi M, Levy H, Eldor A, Iraqi F, Teitelbaum M, Orevi M, et al. (1987). "The saliva of the medicinal leech Hirudo medicinalis--II. Inhibition of platelet aggregation and of leukocyte activity and examination of reputed anaesthetic effects". Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology. 88 (1): 95–98. doi:10.1016/0742-8413(87)90052-1. PMID2890494.
Rigbi M, Levy H, Eldor A, Iraqi F, Teitelbaum M, Orevi M, et al. (1987). "The saliva of the medicinal leech Hirudo medicinalis--II. Inhibition of platelet aggregation and of leukocyte activity and examination of reputed anaesthetic effects". Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology. 88 (1): 95–98. doi:10.1016/0742-8413(87)90052-1. PMID2890494.