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