@article{FPM_2008_14_6_a0,
     author = {A. N. Abyzov and A. A. Tuganbaev},
     title = {Submodules and direct summands},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {3--31},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_6_a0/}
}