Wong BY, Coulter DA, Choi DW, Prince DA (1988). „Dextrorphan and dextromethorphan, common antitussives, are antiepileptic and antagonize N-methyl-D-aspartate in brain slices”. Neuroscience Letters. 85 (2): 261—6. PMID2897648. doi:10.1016/0304-3940(88)90362-X.
Wong BY, Coulter DA, Choi DW, Prince DA (1988). „Dextrorphan and dextromethorphan, common antitussives, are antiepileptic and antagonize N-methyl-D-aspartate in brain slices”. Neuroscience Letters. 85 (2): 261—6. PMID2897648. doi:10.1016/0304-3940(88)90362-X.