@article{Clavero:61426,
      author        = "Clavero, C. and Gracia, J.L. and Shishkin, G. I. and
                       Shishkina, L.P.",
      title         = "{An efficient numerical scheme for 1D parabolic singularly
                       perturbed problems with an interior and boundary layers}",
      year          = "2017",
}