A. Cabada et S. Heikkila, Extremality and comparison results for discontinuous third order functional initial-boundary value problems, J MATH ANAL, 255(1), 2001, pp. 195-212
Extremality and comparison results are derived for third order functional i
nitial-boundary value problems. Differential equations of problems may invo
lve discontinuous nonlinearities. (C) 2001 Academic Press.