Van Voren, Robert (2010). ”Abuse of psychiatry for political purposes in the USSR”. i Helmchen, Hanfried; Sartorius, Norman (på engelska). Ethics in psychiatry. Dordrecht; London: Springer science+business media. sid. 492-494. ISBN 978-90-481-8720-1. http://books.google.se/books?id=70h31egRm40C&pg=PA492. ”When a person is obsessively occupied with something. If you discuss another subject with him, he is a normal person who is healthy, and who may be your superior in intelligence, knowledge and eloquence. But as soon as you mention his favourite subject, his pathological obsessions flare up wildly.”
