@article{DM_2013_25_4_a3,
     author = {K. A. Popkov},
     title = {The diagnosis of states of contacts},
     journal = {Diskretnaya Matematika},
     pages = {30--40},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2013_25_4_a3/}
}