@article{MZM_2010_88_6_a1,
     author = {M. Anwar and J. Pe\v{c}ari\'c},
     title = {On {Log-Convexity} for {Differences} of {Mixed} {Symmetric} {Means}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {811--821},
     publisher = {mathdoc},
     volume = {88},
     number = {6},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2010_88_6_a1/}
}