Differential Equations & Applications · Volume 9, Issue 2 Nonlinear boundary value problems for impulsive differential equations with causal operators 09-13 Pages 161-170 DOI 10.7153/dea-09-13 Downloads Short PDF Full PDF PNG Authors Wen-Li Wang Jing-Feng Tian Keywords nonlinear boundary value problems causal operators monotone iterative technique extremal solutions Subject classes 34B37