@article{DAN_1964_155_1_a1,
     author = {S. I. Alber},
     title = {Homologies of a non-oriented loop space and their application to the calculus of variations in the large},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_1_a1/}
}