Karst, M.; Halpern, J.H.; Bernateck, M.; Passie, T. (2010). “The non-hallucinogen 2-bromo-lysergic acid diethylamide as preventative treatment for cluster headache: An open, non-randomized case series”. Cephalalgia30 (9): 1140-1144. doi:10.1177/0333102410363490. PMID20713566.
Karst, M.; Halpern, J.H.; Bernateck, M.; Passie, T. (2010). “The non-hallucinogen 2-bromo-lysergic acid diethylamide as preventative treatment for cluster headache: An open, non-randomized case series”. Cephalalgia30 (9): 1140-1144. doi:10.1177/0333102410363490. PMID20713566.