@article{10_4064_cm123_1_8,
     author = {Youness Lamzouri and M. Tip Phaovibul and Alexandru Zaharescu},
     title = {On the distribution of the partial sum
 of {Euler's} totient function in residue classes},
     journal = {Colloquium Mathematicum},
     pages = {115--127},
     publisher = {mathdoc},
     volume = {123},
     number = {1},
     year = {2011},
     doi = {10.4064/cm123-1-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm123-1-8/}
}