@article{PA_2013_2_2_a4,
     author = {B. A. Bhayo and J. S\'andor},
     title = {Inequalities connecting generalized trigonometric functions with their inverses},
     journal = {Problemy analiza},
     pages = {82--90},
     year = {2013},
     volume = {2},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2013_2_2_a4/}
}