@article{VNGU_2011_11_4_a9,
     author = {N. V. Trikashnaya},
     title = {Groupoids with {Primitive} {Normal} and {Additive} {Theories}},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {107--116},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2011_11_4_a9/}
}