@article{MZM_1973_14_3_a0,
     author = {E. K. Godunova and V. I. Levin},
     title = {Sharpening certain cyclic inequalities},
     journal = {Matemati\v{c}eskie zametki},
     pages = {305--316},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_3_a0/}
}