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Shepherd, F. B. and Pulleyblank, W. R. (1993) Problems from the Fourth Bellairs Workshop on Combinatorial Optimisation: integer programming with structured matrices. Operational Research working papers (LSEOR 93.7). Department of Operational Research, London School of Economics and Political Science, London, UK.
Shepherd, F. B. and Pulleyblank, W. R. (1992) Formulations for the stable set polytope. Operational Research working papers (LSEOR 92.5). Department of Operational Research, London School of Economics and Political Science, London, UK.