@article{MZM_2011_89_2_a12,
     author = {P. V. Bibikov},
     title = {Separation {Indices} of {Irreducible} {Root} {Systems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {316--318},
     publisher = {mathdoc},
     volume = {89},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_89_2_a12/}
}