Hibell, Björn 1945; Guttormsson, Ulf; Ahlström, Salme 1945; Balakireva, Olga; Þóroddur Bjarnason 1965; Kokkevi, Anna; Kraus, Ludwig; European School Survey Project on Alcohol and Other Drugs (Swedish council for information on alcohol and other drugs, CAN, 2009)