@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/