@article{120246, author = {Irena Rach\r unkov\'a}, title = {Periodic boundary value problems for second order differential equations}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {29}, year = {1990}, pages = {83-91}, zbl = {0752.34021}, mrnumber = {1144833}, language = {en}, url = {http://dml.mathdoc.fr/item/120246} }
Rachůnková, Irena. Periodic boundary value problems for second order differential equations. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 29 (1990) pp. 83-91. http://gdmltest.u-ga.fr/item/120246/
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