@article{DAN_1970_193_6_a1,
     author = {A. Geri\v{s} and W. Gerisch},
     title = {Pontrjagin's space and convergence of the {Bubnov--Galerkin} method},
     journal = {Doklady Akademii Nauk},
     pages = {1218--1221},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a1/}
}