Unordered love in infinite directed graphs. Johnson, Peter D.jun. — 1992 International Journal of Mathematics and Mathematical Sciences
Shields-Harary numbers of graphs with respect to continuous concave cost functions. Holliday, John; Johnson, Peter — 2003 International Journal of Mathematics and Mathematical Sciences
Extending Hall's theorem into list colorings: a partial history. Hoffman, Dean G.; Johnson, Peter D.jun. — 2007 International Journal of Mathematics and Mathematical Sciences
Spectral radius and seminorms in finite-dimensional algebras Peter D. Johnson, Jr. — 1978 Colloquium Mathematicae
Spectral radius and seminorms in finite-dimensional algebras. II Robert Grone; Peter D. Johnson, Jr. — 1982 Colloquium Mathematicae