“Five years of legal physician-assisted suicide in Oregon”. The New England Journal of Medicine348 (10): 961–4. (March 2003). doi:10.1056/NEJM200303063481022. PMID12621146.
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US patent 1954429, Shonle, H. A., "Propyl-Methyl Carbinyl Allyl Barbituric Acid and its Salts", issued 1934-04-10, assigned to Eli Lilly
“Five years of legal physician-assisted suicide in Oregon”. The New England Journal of Medicine348 (10): 961–4. (March 2003). doi:10.1056/NEJM200303063481022. PMID12621146.