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\bibitem{Koshkina_etal1995} Koshkina, E., Melnikov, V. F., Kolesnikov, V., Koykova, I., \& Grechanaia, T. (1995). \textit{Summary of drug misuse trends and situation in 1994 : Russian Federation, Moscow, St. Petersburg, Krasnodar, Yaroslavl, Orenburg, Novosibirsk}  (E. Koshkina, Ed.). Moscow: unknown.

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