@article{IM2_1983_21_1_a3,
     author = {P. A. Kuchment},
     title = {Representations of solutions of periodic partial differential equations},
     journal = {Izvestiya. Mathematics},
     pages = {93--117},
     year = {1983},
     volume = {21},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_1_a3/}
}