@article{MZM_1988_44_2_a11,
     author = {M. I. Shtogrin},
     title = {Action centers of planigons},
     journal = {Matemati\v{c}eskie zametki},
     pages = {262--278},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_44_2_a11/}
}