Total matchings and total coverings of graphs. - Yousef Alavi; M. Behzad; Linda M. Lesniak-Foster; E. A. Nordhaus (J. Graph Theory, 1977)

Minimal separating sets of maximum size. - Yousef Alavi; M. Behzad; E. A. Nordhaus (J. Comb. Theory B, 1980)

Hamiltonian path graphs. - Gary Chartrand; S. F. Kapoor; E. A. Nordhaus (J. Graph Theory, 1983)