@misc{moertsell2001gravitational,
  title={Gravitational lensing of the farthest known supernova SN1997ff},
  author={Edvard Moertsell and Christofer Gunnarsson and Ariel Goobar},
  year={2001},
  eprint={astro-ph/0105355},
  archivePrefix={arXiv},
  primaryClass={astro-ph},
  doi={10.1086/323242},
  url={https://arxiv.org/abs/astro-ph/0105355}
}