@misc{gunnarsson2002massive,
  title={Massive galaxy clusters as gravitational telescopes for distant supernovae},
  author={Christofer Gunnarsson and Ariel Goobar},
  year={2002},
  eprint={astro-ph/0211401},
  archivePrefix={arXiv},
  primaryClass={astro-ph},
  doi={10.1051/0004-6361:20030648},
  url={https://arxiv.org/abs/astro-ph/0211401}
}