Extended Partial Geometries: Nets and Dual Nets. - Sylvia A. Hobart; Daniel R. Hughes (Eur. J. Comb., 1990)

Extended Partial Geometries: Dual 2-Designs. - Daniel R. Hughes (Eur. J. Comb., 1990)

Partitions in Matrices and Graphs. - Daniel R. Hughes; Navin M. Singhi (Eur. J. Comb., 1991)