@article{10_21136_CMJ_1980_101671,
     author = {Herrmann, Leopold},
     title = {Periodic solutions of abstract differential equations: the {Fourier} method},
     journal = {Czechoslovak Mathematical Journal},
     pages = {177--206},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1980},
     doi = {10.21136/CMJ.1980.101671},
     mrnumber = {566046},
     zbl = {0445.35013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101671/}
}