@article{steinig:1972:slf,
    author = {Steinig, J.},
     title = {The sign of {L}ommel's function},
   journal = {Trans. Amer. Math. Soc.},
  fjournal = {Transactions of the American Mathematical Society},
    volume = {163},
      year = {1972},
     pages = {123–129},
      issn = {0002-9947},
   mrclass = {33.25},
  mrnumber = {MR0284625 (44 \#1849)},
mrreviewer = {F. W. J. Olver},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0002-9947%28197201%29163%3C123%3ATSOLF%3E2.0.CO%3B2-2}},
     zblno = {0227.33017}}