@article{FPM_2014_19_2_a0,
     author = {A. N. Abyzov and A. A. Tuganbaev},
     title = {Retractable and coretractable modules},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {5--20},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2014_19_2_a0/}
}