@article{RM_1961_16_4_a3,
     author = {B. S. Mityagin},
     title = {Approximate dimension and bases in nuclear spaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {59--127},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1961},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_4_a3/}
}