@article{UZKU_2006_148_2_a1,
     author = {I. F. Borkhanov and V. R. Fazylov},
     title = {On the optimal reduction of the costs matrix},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {18--22},
     publisher = {mathdoc},
     volume = {148},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2006_148_2_a1/}
}