@article{AMI_2015_45_a9,
     author = {J\'ozsef S\'andor},
     title = {A note on log-convexity of power means},
     journal = {Annales mathematicae et informaticae},
     pages = {107--110},
     publisher = {mathdoc},
     volume = {45},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2015_45_a9/}
}