Andersen, Niels Byrial. “Invariant Fundamental Solutions and Solvability for $\mathrm{GL} (n, \mathsf{C}) U(p,q)$”. MATHEMATICA SCANDINAVICA 86, no. 1 (March 1, 2000): 143–160. Accessed December 6, 2025. https://www.mscand.dk/article/view/14286.