@article{MV_1964_16_2_a10,
     author = {M. Marjanovi\'c},
     title = {An elementary inequality},
     journal = {Matemati\v{c}ki vesnik},
     pages = {153 },
     year = {1964},
     volume = {16},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/MV_1964_16_2_a10/}
}