Psychological Effects of (S)-Ketamine and N,N-Dimethyltryptamine (DMT): A Double-Blind, Cross-Over Study in Healthy Volunteers - Gouzoulis-Mayfrank, E; Heekeren, K; Neukirch, A; Stoll, M; Stock, C; Obradovic, M; Kovar, K -A (Pharmacopsychiatry, 2005)