Ludwig Brieger, "Weitere Untersuchungen über Ptomaine" [Further investigations into ptomaines] (Berlin, Germany: August Hirschwald, 1885), page 43. From page 43: Ich nenne dasselbe Putrescin, von putresco, faul werden, vermodern, verwesen. (I call this [compound] "putrescine", from [the Latin word] putresco, to become rotten, decay, rot.)
Ludwig Brieger, "Weitere Untersuchungen über Ptomaine" [Further investigations into ptomaines] (Berlin, Germany: August Hirschwald, 1885), page 39.
Til, H.P.; Falke, H.E.; Prinsen, M.K.; Willems, M.I. (1997). “Acute and subacute toxicity of tyramine, spermidine, spermine, putrescine and cadaverine in rats”. 《Food and Chemical Toxicology》 35 (3–4): 337–348. doi:10.1016/S0278-6915(97)00121-X. ISSN0278-6915. PMID9207896.
Srivenugopal KS, Adiga PR (September 1981). “Enzymic conversion of agmatine to putrescine in Lathyrus sativus seedlings. Purification and properties of a multifunctional enzyme (putrescine synthase).”. 《J. Biol. Chem.》 256 (18): 9532–41. PMID6895223.
Til, H.P.; Falke, H.E.; Prinsen, M.K.; Willems, M.I. (1997). “Acute and subacute toxicity of tyramine, spermidine, spermine, putrescine and cadaverine in rats”. 《Food and Chemical Toxicology》 35 (3–4): 337–348. doi:10.1016/S0278-6915(97)00121-X. ISSN0278-6915. PMID9207896.
Til, H.P.; Falke, H.E.; Prinsen, M.K.; Willems, M.I. (1997). “Acute and subacute toxicity of tyramine, spermidine, spermine, putrescine and cadaverine in rats”. 《Food and Chemical Toxicology》 35 (3–4): 337–348. doi:10.1016/S0278-6915(97)00121-X. ISSN0278-6915. PMID9207896.