Identifying classes of conjoint alcohol and marijuana use in entering freshmen
Psychology of Addictive Behaviors (2015) - Comment
pubmed: 26168228  doi: 10.1037/adb0000089  issn: 1939-1501  issn: 0893-164x 

Amie L. Haas, Robert Wickham, Kathryn Macia, Micah Shields, Rayna Macher, Tilman Schulte