1. The March of Medicine;Glasscheib,1964
2. The history of leeching and hirudin;Fields;Haemostasis,1991
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4. Bloodsucking leeches discovering a new niche as microsurgery aid;Kennedy;Los Angeles Times,1987
5. Cloning and expression of a cDNA coding for the anticoagulant hirudin from the blood-sucking leech, Hirudo medicinalis;Harvey,1986