Bhargava, S., N. M. S. Mahadeva, and M. C. Maheshkumar. “A Modular Transformation for a Generalized Theta Function With Multiple Parameters”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 8, Aug. 2009, pp. 1040-52, https://umj.imath.kiev.ua/index.php/umj/article/view/3079.