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(en) Mahmoud A. ElSohly, Zlatko Mehmedic, Susan Foster et Chandrani Gon, « Changes in Cannabis Potency Over the Last 2 Decades (1995–2014): Analysis of Current Data in the United States », Biological Psychiatry, cannabinoids and Psychotic Disorders, vol. 79, no 7, , p. 613–619 (ISSN0006-3223, DOI10.1016/j.biopsych.2016.01.004, lire en ligne, consulté le )