@article{MV_1972_24_1_a40,
     author = {H. Johnen},
     title = {Inequalities connected with the moduli of smootness},
     journal = {Matemati\v{c}ki vesnik},
     pages = {289 },
     year = {1972},
     volume = {24},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a40/}
}