LeibovO. S., and FedorchukV. M. 1996. “Symmetry Reduction and Exact Solutions of the Multidimensional Monge-Ampere Equation”. Ukrains’kyi Matematychnyi Zhurnal 48 (5), 695-701. https://umj.imath.kiev.ua/index.php/umj/article/view/5302.