Hu, Naihong, and XiaLi-Meng. 2014. “Vertex Operator Representations of Type $C_l^{(1)}$ and Product-Sum Identities”. Ukrains’kyi Matematychnyi Zhurnal 66 (2), 226–243. https://umj.imath.kiev.ua/index.php/umj/article/view/2126.