@article{CMUC_1980__21_4_a1,
     author = {Vejvoda, Otto and Kop\'a\v{c}kov\'a, Marie},
     title = {Periodic solutions of abstract and partial differential equations with deviation},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {645--652},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1980},
     mrnumber = {597755},
     zbl = {0454.35008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_4_a1/}
}