@article{DAN_1960_133_2_a6,
     author = {S. G. Krein and O. I. Prozorovskaya},
     title = {Analytic semigroups and incorrect problems for evolutionary equations},
     journal = {Doklady Akademii Nauk},
     pages = {277--280},
     publisher = {mathdoc},
     volume = {133},
     number = {2},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_2_a6/}
}