A characterization of uniquely colorable mixed hypergraphs of order n with upper chromatic numbers n-1 and n-2. - Angela Niculitsa; Heinz-Jürgen Voss (Australas. J Comb., 2000)

About uniquely colorable mixed hypertrees. - Angela Niculitsa; Vitaly I. Voloshin (Discuss. Math. Graph Theory, 2000)