{{Cite journal| doi = 10.1097/00063110-199506000-00009| issn = 0969-9546 (Print) 0969-9546 (Linking)| volume = 2| issue = 2| pages = 97–101| last = Osterwalder| first = J. J.| title = Patients intoxicated with heroin or heroin mixtures: how long should they be monitored?| journal = Eur J Emerg Med| date = 1995-06-01| pmid = 9422191}}