@article{10_4153_CMB_1987_061_x,
     author = {Murty, M. Ram and Srinivasan, S.},
     title = {On {The} {Number} of {Groups} of {Squarefree} {Order}},
     journal = {Canadian mathematical bulletin},
     pages = {412--420},
     year = {1987},
     volume = {30},
     number = {4},
     doi = {10.4153/CMB-1987-061-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-061-x/}
}