@article{10_4064_cm133_2_8,
     author = {Min Tang and Xiao-Zhi Ren and Meng Li},
     title = {On near-perfect and deficient-perfect numbers},
     journal = {Colloquium Mathematicum},
     pages = {221--226},
     publisher = {mathdoc},
     volume = {133},
     number = {2},
     year = {2013},
     doi = {10.4064/cm133-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm133-2-8/}
}