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Altamura AC, Mauri MC, De Novellis F, Percudani M, Vampini V (tháng 11 năm 1989). “Residual neuroleptic-induced parkinsonian symptoms in schizophrenia. A naturalistic study with orphenadrine”. Pharmacopsychiatry. 22 (6): 246–9. doi:10.1055/s-2007-1014608. PMID2616635.