@article{10_4064_cm_68_1_55_58,
     author = {J. Browkin and A. Schinzel},
     title = {On integers not of the form n - \ensuremath{\varphi} (n)},
     journal = {Colloquium Mathematicum},
     pages = {55--58},
     publisher = {mathdoc},
     volume = {68},
     number = {1},
     year = {1995},
     doi = {10.4064/cm-68-1-55-58},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-68-1-55-58/}
}