@article{MZM_1976_20_2_a4,
     author = {E. K. Godunova and V. I. Levin},
     title = {Exactness of a nontrivial estimate in a cyclic inequality},
     journal = {Matemati\v{c}eskie zametki},
     pages = {203--205},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_2_a4/}
}