@article{TIMB_2015_23_2_a4,
     author = {D. B. Efimov},
     title = {On upper bound of permanents},
     journal = {Trudy Instituta matematiki},
     pages = {37--42},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMB_2015_23_2_a4/}
}