1. The “alter ego” in psychiatry
Prof Mario Berta, MD, Prof Mario Saiz, MD 
The Lancet 
Volume 354, (December 1999)
DOI: /S (99)
Copyright © 1999 Elsevier Ltd Terms and Conditions

2. The Lancet 1999 354, DOI: (10.1016/S0140-6736(99)90398-7)
Copyright © 1999 Elsevier Ltd Terms and Conditions

3. Detail of a stained-glass window from Chartres cathedral, France
A conflict between a white knight and a dark knight—between a “self” and its dark “alter ego”
The Lancet  , DOI: ( /S (99) )
Copyright © 1999 Elsevier Ltd Terms and Conditions