@article{SM_1981_39_2_a3,
     author = {I. M. Spitkovsky},
     title = {Some estimates for the partial indices of measurable matrix-valued functions},
     journal = {Sbornik. Mathematics},
     pages = {207--226},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_39_2_a3/}
}