@article{SM_1986_54_2_a12,
     author = {Yu. P. Pyt'ev},
     title = {Methods of reduction of measurements in {Hilbert} spaces},
     journal = {Sbornik. Mathematics},
     pages = {525--549},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_54_2_a12/}
}