@article{10_4064_ap_26_3_335_339,
     author = {Stanis{\l}aw S\k{e}dziwy},
     title = {Periodic solutions of differential equations in the cylindrical space},
     journal = {Annales Polonici Mathematici},
     pages = {335--339},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1972},
     doi = {10.4064/ap-26-3-335-339},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-3-335-339/}
}