[1]
Lopushansky О. V. ., “Operator calculus on ultrasmooth vectors”, Ukr. Mat. Zhurn., vol. 44, no. 4, pp. 502–513, Apr. 1992, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/7892