INTRODUCTION TO KNOT THEORYRICHARD H. CROWELL RALPH H. FOX · SPRINGER-VERLAG NEW YORK HEIDELBERG BERLIN · 2222

On the Lusternik-Schnirelmann CategoryRalph H. Fox · Annals of Mathematics (Second Series) · 1941

Torus Homotopy GroupsRalph H. Fox · Proceedings of the National Academy of Sciences of the United States of America · 1945

parallelotopesFox, Ralph H. · Duke Mathematical Journal · 1941

A Remarkable Simple Closed CurveRalph H. Fox · Annals of Mathematics (Second Series) · 1949

Homotopy Groups and Torus Homotopy GroupsRalph H. Fox · Annals of Mathematics (Second Series) · 1948

On topologies for function spacesFox, Ralph H. · Bulletin of the American Mathematical Society · 1945

Davis Martin, Putnam Hilary, and Robinson Julia. The decision problem for exponential diophantine equations. Annals of mathematics, second series vol. 74 (1961), pp. 425–436.Rogers, Hartley · The Journal of Symbolic Logic · 1970