1. SELF-DUALITY AND N=2 STRING MAGIC
2. Geometry of n = 2 strings
3. N = 2 heterotic strings
4. R.S. Ward, in: Field theory, quantum gravity and strings, Vol. 2, eds. H.J. De Vega and N. Sanchez, p. 106.
5. S.J. Gates Jr., H. Nishino and S.V. Ketov, Extended supersymmetry and self-duality in 2 + 2 dimensions, preprint UMDEPP 92–187; Supersymmetric self-dual Yang-Mills and supergravity as background of Green-Schwarz superstring, preprint UMDEPP 92–171; Majorana-Weyl spinors and self-dual gauge fields in 2 + 2 dimensions, preprint UMDEPP 92–163.