1. D. Gale, The theory of linear economic models (McGraw-Hill, New York, 1960).
2. A.J. Hoffman, “On approximate solutions of systems of linear inequalities”, Journal of Research of the National Bureau of Standards, Section B, Mathematical Sciences 49 (1952) 263–265.
3. S.M. Robinson, “An implicit-function theorem for generalized variational inequalities”, Technical summary report 1672, Mathematics Research Center, University of Wisconsin-Madison (1976);
4. National Technical Information Service accession No. AD A031952.
5. S.M. Robinson, “Generalized equations and their solutions, part I: basic theory”, Mathematical Programming Study 10 (1979) 128–141.