Zhang X., Liu L., Wu Y., and Cui Y. “A Sufficient and Necessary Condition of Existence of Blow-up Radial Solutions for a K-Hessian Equation With a Nonlinear Operator”. Nonlinear Analysis: Modelling and Control, Vol. 25, no. 1, Jan. 2020, pp. 126–143, doi:10.15388/namc.2020.25.15736.