@article{10_5817_AM2013_1_35,
     author = {Jaro\v{s}, Jaroslav},
     title = {Wirtinger inequality and nonlinear differential systems},
     journal = {Archivum mathematicum},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {2013},
     doi = {10.5817/AM2013-1-35},
     mrnumber = {3073014},
     zbl = {06321146},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5817/AM2013-1-35/}
}