@article{TIMM_2013_19_2_a4,
     author = {N. N. Astaf'ev},
     title = {Dual systems of homogeneous linear equations},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {48--53},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2013_19_2_a4/}
}