@article{DAN_1987_297_6_a7,
     author = {A. V. Rozenblyum and L. V. Rozenblyum},
     title = {Spectral analysis of the infinitesimal operators of},
     journal = {Doklady Akademii Nauk},
     pages = {1317--1321},
     publisher = {mathdoc},
     volume = {297},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_6_a7/}
}