@article{RM_1982_37_2_a36,
     author = {B. Yu. Sternin},
     title = {On the regularization of equations of subprincipal type},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {261--262},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1982_37_2_a36/}
}