@article{SM_1973_21_2_a1,
     author = {V. S. Rabinovich},
     title = {A~priori estimates and the {Fredholm} property for a~class of pseudo\-differential operators},
     journal = {Sbornik. Mathematics},
     pages = {191--206},
     year = {1973},
     volume = {21},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_21_2_a1/}
}