@article{10_21136_CMJ_1977_101479,
     author = {Naumann, Joachim},
     title = {Periodic solutions to certain evolution inequalities},
     journal = {Czechoslovak Mathematical Journal},
     pages = {424--433},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1977},
     doi = {10.21136/CMJ.1977.101479},
     mrnumber = {0500351},
     zbl = {0379.47032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101479/}
}