Graph with given achromatic number. - Pavol Hell; Donald J. Miller (Discret. Math., 1976)

Concerning the achromatic number of graphs. - Martin Farber; Gena Hahn; Pavol Hell; Donald J. Miller (J. Comb. Theory B, 1986)

On multiplicative graphs and the product conjecture. - Roland Häggkvist; Pavol Hell; Donald J. Miller; Victor Neumann-Lara (Comb., 1988)

Achromatic numbers and graph operations. - Pavol Hell; Donald J. Miller (Discret. Math., 1992)