@article{AFM_1979_4_1_a8,
     author = {Ilppo Simo Louhivaara and Christian  G. Simader},
     title = {\"Uber periodische {L\"osungen} koerzitiver linearer partieller {Differentialgleichungen}},
     journal = {Annales Fennici Mathematici},
     pages = {87--108},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1979},
     doi = {10.5186/aasfm.1978-79.0410},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1978-79.0410/}
}