"Levels and correlates of polydrug use among heroin users and regular amphetamine users"@en . . . . "\u043D\u0430\u0443\u043A\u043E\u0432\u0430 \u0441\u0442\u0430\u0442\u0442\u044F, \u043E\u043F\u0443\u0431\u043B\u0456\u043A\u043E\u0432\u0430\u043D\u0430 \u0432 \u0436\u043E\u0432\u0442\u043D\u0456 1995"@uk . "10.1016/0376-8716(95)01171-9" . "8556972" . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@en . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@en . "wetenschappelijk artikel"@nl . . "1995-10-01T00:00:00Z"^^ . . "W Hall" . . "scientific article published on 01 October 1995"@en . "39" . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@nl . . "3" . . "231-235" . . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@nl . "im Oktober 1995 ver\u00F6ffentlichter wissenschaftlicher Artikel"@de . . . "art\u00EDculu cient\u00EDficu espubliz\u00E1u n'ochobre de 1995"@ast . . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@nl . . "Levels and correlates of polydrug use among heroin users and regular amphetamine users"@en . . "S Darke" . . .