@article{10_4153_CMB_1971_092_9,
     author = {Lindstr\"om, Bernt},
     title = {On {M\"obius} {Functions} and a {Problem} in {Combinatorial} {Number} {Theory}},
     journal = {Canadian mathematical bulletin},
     pages = {513--516},
     year = {1971},
     volume = {14},
     number = {4},
     doi = {10.4153/CMB-1971-092-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-092-9/}
}