@ARTICLE{Ling+Takeuchi-PoinSourIdenProb:09,
  author       = {Ling, L. and Takeuchi, T.},
  title        = {Point sources identification problems for heat equations},
  journal      = {Commun. Comput. Phys.},
  fjournal     = {Communications in Computational Physics},
  volume       = {5},
  number       = {5},
  pages        = {897-913},
  year         = {2009},
}