1. A note on Q-matrices;Aganagic;Math. Programming,1979
2. On a problem in linear inequalities;Cottle;J. London Math. Soc.,1968
3. The principal pivoting method revisited;Cottle;Math. Programming,1990
4. Least-index resolution of degeneracy in linear complementarity problems with sufficient matrices;Cottle,1990
5. R.W. Cottle and S.M. Guu, Two characterizations of sufficient matrices, Technical Report SOL 90-17, Systems Optimization Lab., Dept. of Operations Research, Stanford Univ., Stanford, Calif.; Linear Algebra Appl., to appear.