@article{FPM_2003_9_3_a12,
     author = {O. A. Pshenitsyna},
     title = {Factor and term ranks for matrix union over semirings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {175--197},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2003_9_3_a12/}
}