@article{05725771, title = {Optimal conditions for maximum and antimaximum principles of the periodic solution problem.}, journal = {Boundary Value Problems [electronic only]}, volume = {2010}, year = {2010}, doi = {10.1155/2010/410986}, zbl = {1200.34001}, language = {en}, url = {http://dml.mathdoc.fr/item/05725771} }
Zhang, Meirong. Optimal conditions for maximum and antimaximum principles of the periodic solution problem.. Boundary Value Problems [electronic only], Tome 2010 (2010) . doi : 10.1155/2010/410986. http://gdmltest.u-ga.fr/item/05725771/