@article{FPM_2016_21_2_a12,
     author = {V. D. Shmatkov},
     title = {Isomorphisms of groups of invertible elements of incidence algebras},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {257--261},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2016_21_2_a12/}
}