@article{10_4064_aa171111_7_2,
     author = {L\'aszl\'o T\'oth and Wenguang Zhai},
     title = {On the error term concerning the number of subgroups of the groups $\mathbb {Z}_m \times \mathbb {Z}_n$ with $m,n\le x$},
     journal = {Acta Arithmetica},
     pages = {285--299},
     publisher = {mathdoc},
     volume = {183},
     number = {3},
     year = {2018},
     doi = {10.4064/aa171111-7-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa171111-7-2/}
}