@article{104775, author = {Jerrold W. Bebernes and Klaus Schmitt}, title = {An existence theorem for periodic boundary value problems for systems of second order diffferential equations}, journal = {Archivum Mathematicum}, volume = {008}, year = {1972}, pages = {173-176}, zbl = {0284.34016}, mrnumber = {0335926}, language = {en}, url = {http://dml.mathdoc.fr/item/104775} }
Bebernes, Jerrold W.; Schmitt, Klaus. An existence theorem for periodic boundary value problems for systems of second order diffferential equations. Archivum Mathematicum, Tome 008 (1972) pp. 173-176. http://gdmltest.u-ga.fr/item/104775/
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