Bavula, V. V. “Classification of Modules of Dimension $n$ and Multiplicity 1 over the Weyl Algebra $A_n$”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 5 (May 25, 1996): 579-587. Accessed May 18, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5290.