@article{FPM_2010_16_7_a2,
     author = {E. I. Bunina and L. V. Tupikina},
     title = {Automorphisms of the semigroup of nonnegative invertible matrices of order~$2$ over rings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {49--60},
     publisher = {mathdoc},
     volume = {16},
     number = {7},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2010_16_7_a2/}
}