@article{DAN_1967_172_1_a10,
     author = {B. Yu. Sternin},
     title = {Elliptic (co)boundary morphisms},
     journal = {Doklady Akademii Nauk},
     pages = {44--47},
     publisher = {mathdoc},
     volume = {172},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a10/}
}