V. V. Bavula, “Classification of modules of dimension $n$ and multiplicity 1 over the Weyl algebra $A_n$”, Ukr. Mat. Zhurn., vol. 48, no. 5, pp. 579–587, May 1996, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5290