@article{MZM_2013_94_3_a8,
     author = {V. O. Tonkov},
     title = {Addition to the {Popoviciu} {Theorem}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {416--425},
     publisher = {mathdoc},
     volume = {94},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_94_3_a8/}
}