@article{SJIM_2007_10_4_a12,
     author = {S. P. Sidorov},
     title = {An estimate for the relative linear width of the unit ball for a class of positive operators},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {122--128},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2007_10_4_a12/}
}