A simple functional operator. Risteski, Ice B., Trenčevski, Kostadin G., Covachev, Valéry C. (1999) The New York Journal of Mathematics [electronic only]
A synthesis of multidimensional judgements consistent with linear transformations. Claudi Alsina (1991) Aequationes mathematicae
Analytic roots of invertible matrix functions. Rodman, Leiba, Spitkovsky, Ilya M. (2005) ELA. The Electronic Journal of Linear Algebra [electronic only]