An application of category theory to a class of the systems of the superquadratic wave equations. Jung, Tacksun; Choi, Q-Heung — 2010 Journal of Inequalities and Applications [electronic only]
Nontrivial solutions of the asymmetric beam system with jumping nonlinear terms. Jung, Tacksun; Choi, Q-Heung — 2010 Boundary Value Problems [electronic only]
Existence of four solutions of some nonlinear Hamiltonian system. Jung, Tacksun; Choi, Q-Heung — 2008 Boundary Value Problems [electronic only]