@article{DAN_1961_141_6_a8,
     author = {I. I. Shmulev},
     title = {Periodic solutions of boundary-value problems without initial conditions for parabolic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1313--1316},
     publisher = {mathdoc},
     volume = {141},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_6_a8/}
}