A minimum-maximum principle for a class of non-linear integral equations Charles Vernon Coffman 10.1184/R1/6476561.v1 https://kilthub.cmu.edu/articles/journal_contribution/A_minimum-maximum_principle_for_a_class_of_non-linear_integral_equations/6476561 Mathematics Technical Report 1968-01-01 00:00:00 Nonlinear integral equations. Boundary value problems.