@article{SM_1998_189_10_a7,
     author = {B. Yu. Sternin and V. E. Shatalov and B. Schulze},
     title = {On general boundary-value problems for elliptic equations},
     journal = {Sbornik. Mathematics},
     pages = {1573--1586},
     publisher = {mathdoc},
     volume = {189},
     number = {10},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_10_a7/}
}