@article{GilMerinoGoicoecheaSerraRicartetal.2001,
  author    = {Rodrigo Gil-Merino and Luis Julian Goicoechea and M. Serra-Ricart and Alejandro Oscoz and D. Alcalde and E. Mediavilla},
  title     = {Short time-scale fluctuations in the difference light curves of QSO 0957+561A,B: microlensing or noise?},
  year      = {2001},
}