1975 
54. On regular bipartitepreserving supergraphs.
(with C. E. Wall) Aequationes Math.
13 (1975) 97101.
55. The existence of 2factors in squares of graphs. Czech. J. Math. 100 (1975) 56. Intercyclic graphs. (with A. D. Polimeni and M. J. Stewart) Nanta Math. 8 4749. 
1976 
57. Maximal pointarboritic graphs.
(with F.
Harary and D. R. Lick)
Utilitas Math.
9 (1976) 259262.
58. Degree sets for digraphs. Period. Math. Hungar. (with L. Lesniak and J. Roberts) 7 (1976) 7785. 
1978 
59. Mixed ramsey numbers:
chromatic numbers versus graphs.
(with J. M. Benedict and D. R. Lick)
J. Graph Theory 2
(1978) 107118.

1979 
60. A note on 1factors in graphs.
(with L. NebeskOy) Period. Math. Hungar.
10 (1979) 4146.
61. On homogeneously traceable nonhamiltonian graphs. (with R. J. Gould and S. F. Kapoor) Ann. N. Y. Acad. Sci. 319 (1979) 130135. 62. A note on locally connected and hamiltonian connected graphs. (with R. J. Gould and A. D. Polimeni) Israel J. Math. 33 (1979) 58. 63. A sufficient condition for graphs with 1factors. (with D. G. Goldsmith and S. Schuster) Colloq. Math. 41 (1979) 173 178. 