@article{10_4064_ba59_2_2,
     author = {A. Schinzel},
     title = {Solution to a {Problem} of
  {Lubelski} and an {Improvement} of a {Theorem} of {His}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {115--119},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {2011},
     doi = {10.4064/ba59-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba59-2-2/}
}