Hall's condition yields less for multicolorings. - Matthew M. Cropper (Australas. J Comb., 1998)

Extending the disjoint-representatives theorems of Hall, Halmos, and Vaughan to list-multicolorings of graphs. - Matthew M. Cropper; John L. Goldwasser; Anthony J. W. Hilton; Dean G. Hoffman; Peter D. Johnson Jr. (J. Graph Theory, 2000)

Restricted list coloring and Hall's condition. - Matthew M. Cropper; John L. Goldwasser (Discret. Math., 2002)

Problems on Hall t-chromaticity. - Matthew M. Cropper; Peter D. Johnson Jr. (Ars Comb., 2005)