Codes and Designs. - William G. Bridges; Marshall Hall Jr.; John L. Hayden (J. Comb. Theory A, 1981)

Association Algebras for Finite Projective Planes. - John L. Hayden (J. Comb. Theory A, 1983)

On Symmetric Incidence Matrices of Projective Planes. - P. Dey; John L. Hayden (Des. Codes Cryptogr., 1995)

Generalized Hadamard Matrices. - John L. Hayden (Des. Codes Cryptogr., 1997)

Eigenvalues of Finite Projective Planes with an Abelian Cartesian Group. - John L. Hayden (Des. Codes Cryptogr., 2004)