Two free-boundary problems with singularities L. Fox — 1974 Acta Universitatis Carolinae. Mathematica et Physica
Generalized Consistent Ordering and the Optimum Successive Over-Relaxation Factor. N.K. NiCHOLS; L. Fox — 1969 Numerische Mathematik
Nonlinear optimization using the generalized reduced gradient method Leon S. Lasdon; Richard L. Fox; Margery W. Ratner — 1974 RAIRO - Operations Research - Recherche Opérationnelle