Karlsson, MO; Dahlström, B; Neil, A (1988). "Characterization of high-affinity binding sites for the antitussive 3Hnoscapine in guinea pig brain tissue". European Journal of Pharmacology. 145 (2): 195–203. doi:10.1016/0014-2999(88)90230-0. PMID3350041.
Frick, S; Kramell, R; Schmidt, J; Fist, AJ; Kutchan, TM (2005). "Comparative qualitative and quantitative determination of alkaloids in narcotic and condiment Papaver somniferum cultivars". Journal of Natural Products. 68 (5): 666–73. doi:10.1021/np0496643. PMID15921406.
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Karlsson, MO; Dahlström, B; Neil, A (1988). "Characterization of high-affinity binding sites for the antitussive 3Hnoscapine in guinea pig brain tissue". European Journal of Pharmacology. 145 (2): 195–203. doi:10.1016/0014-2999(88)90230-0. PMID3350041.
Frick, S; Kramell, R; Schmidt, J; Fist, AJ; Kutchan, TM (2005). "Comparative qualitative and quantitative determination of alkaloids in narcotic and condiment Papaver somniferum cultivars". Journal of Natural Products. 68 (5): 666–73. doi:10.1021/np0496643. PMID15921406.