Toward the Universal Theory of Strings
arXiv:hep-th/9402042 · doi:10.1016/0370-2693(94)91524-5
Abstract
We show that the $N=2$ superstrings may be viewed as a special class of the $N=4$ superstrings and demonstrate their equivalence. This allows us to realize all known string theories based on linear algebras and with $N<4$ supersymmetries as special choices of the vacua in the $N=4$ superstring.
Latex file, 8 pages, NBI-HET-94-08. The preprint number is changed and one reference is added