Alprazolam, propranolol, and placebo in the treatment of panic disorder and agoraphobia with panic attacks.
Munjack DJ, Crocker B, Cabe D, Brown R, Usigli R, Zulueta A, McManus M, McDowell D, Palmer R, Leonard M. J Clin Psychopharmacol. 1989 Feb; 9(1):22-7.