1. Christodoulou GN, ed: The Delusional Misidentification Syndromes. Basel, Switzerland: Karger; 1986.
2. Christodoulou GN: The origin of the concept of doubles. In The Delusional Misidentification Syndromes. Edited by Christodoulou GN. Basel, Switzerland: Karger; 1986:1–8.
3. Capgras J, Reboul-Lachaux J: L’illusion des socies dans un delire systematise chronique [in French]. Bull Soc Clin Med Ment 1923, 11:6–16.
4. Courbon P, Fail G: Illusion de Fregoli [in French]. Bull Soc Clin Med Ment 1927, 15:121–124.
5. Courbon P, Tusques J: Illusions d’intermetamorfose et de la charme [in French]. Ann Med Psychol (Paris) 1932, 90I:401–406.