On 1-factors of point determining graphs. - Dennis P. Geoffroy (Discret. Math., 1978)

Nuclei for totally point determining graphs. - Dennis P. Geoffroy (Discret. Math., 1978)

The edge nucleus of a point-determining graph. - Dennis P. Geoffroy; David P. Sumner (J. Comb. Theory B, 1978)

An upper bound on the size of a largest clique in a graph. - Dennis P. Geoffroy; David P. Sumner (J. Graph Theory, 1978)