@article{ASUO_2013_XXI_2_a4,
     author = { Bradut Apostol },
     title = { Extremal orders of some functions connected to regular integers
                            modulo n },
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXI},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2013_XXI_2_a4/}
}