@article{10_4153_CMB_1990_037_0,
     author = {Yokota, Hisashi},
     title = {On {Number} of {Integers} {Representable} as {Sums} of {Unit} {Fractions}},
     journal = {Canadian mathematical bulletin},
     pages = {235--241},
     year = {1990},
     volume = {33},
     number = {2},
     doi = {10.4153/CMB-1990-037-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1990-037-0/}
}