Minimal k-saturated and color critical graphs of prescribed minimum degree. - D. A. Duffus; Denis Hanson (J. Graph Theory, 1986)

An Explicit 1-Factorization in the Middle of the Boolean Lattice. - D. A. Duffus; Hal A. Kierstead; Hunter S. Snevily (J. Comb. Theory A, 1994)