“Local Solvability for a Class of Nonhomogeneous Left Invariant Differential Operators on HR \bigotimes Rk”, J. Part. Diff. Eq., vol. 3, no. 2, pp. 16–26, Mar. 1990, Accessed: Dec. 06, 2025. [Online]. Available: https://global-sci.com/index.php/jpde/article/view/3656