@article{PA_2014_3_1_a2,
     author = {E. Neuman},
     title = {Optimal bounds for certain bivariate means},
     journal = {Problemy analiza},
     pages = {35--43},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2014_3_1_a2/}
}