@article{PugaAlcaldeBarrenaetal.2001,
  author    = {Puga, E. and Alcalde, D. and Barrena, R. and Mediavilla, E. and Motta, V. and Munoz, J. A. and Oscoz, Alejandro and Serra-Ricart, M. and Gil-Merino, Rodrigo and Goicoechea, Luis Julian and Lewis, G. f and Libbrecht, C. and Moreau, O. and Surdej, J. and Wambsganß, Joachim},
  title     = {Daily monitoring of the gravitational lens QSO 2237+0305 at the Nordic Optical Telescope},
  isbn      = {0-7923-6974-2},
  year      = {2001},
  language  = {en}
}