@book{ Solr-357924, title = {Positive solutions of differential, difference and integral equations / by Ravi P. Agarwal, Donal O'Regan and Patricia J.Y. Wong.}, author = {Agarwal, Ravi P.}, editor = {O'Regan, Donal}, editor = {Wong, Patricia J. Y.}, address = {Dordrecht ; London}, publisher = {Kluwer Academic Publishers}, year = {1999}, pages = {416}, }