Subjective and psychomotor effects of subanaesthetic doses of propofol in healthy volunteers. - Zacny,J.P.; Lichtor,J.L.; Coalson,D.W.; Finn,R.S.; Uitvlugt,A.M.; Glosten,B.; Flemming,D.C.; Apfelbaum,J.L. (Anesthesiology, 1992)