@article{SM_1972_18_1_a0,
     author = {S. Ya. Havinson and Z. S. Romanova},
     title = {Approximation properties of finite-dimensional subspaces in~$L_1$},
     journal = {Sbornik. Mathematics},
     pages = {1--14},
     year = {1972},
     volume = {18},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_1_a0/}
}