@article{etna_vol35_pp69-87,
  author  = {Ana Alonso and Anah{\'i} Dello Russo},
  title   = {Spectral approximation of variationally formulated eigenvalue problems on curved domains},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {35},
  year    = {2009},
  pages   = {69--87},
}