@article{JIS_2009__12_5_a6,
     author = {T\'oth,  L\'aszl\'o},
     title = {On the bi-unitary analogues of {Euler's} arithmetical function and the gcd-sum function},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {5},
     zbl = {1192.11005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_5_a6/}
}