@article{article1153,
  title = {An asymptotic formula for the sum of the negative eigenvalues of second order differential operator given in infinite interval},
  author = {BAKŞİ, Ã. and Ä°SMAYÄ°LOV, S.},
  journal = {Sigma Journal of Engineering and Natural Sciences},
  year = {2005},
  volume = {23},
  pages = {87-98},
  doi = {}
}