@article{Alvarez1980the,
  author = {Alvarez and Alvarez and Asaro and others},
  title = {Extraterrestrial Cause for the Cretaceous-Tertiary Extinction},
  journal = {Science},
  year = {1980},
  doi = {10.1126/science.208.4448.1095},
  url = {https://doi.org/10.1126/science.208.4448.1095}
}

@article{Lyson2019recovery,
  author = {Lyson and Miller and Bercovici and others},
  title = {Exceptional continental record of biotic recovery after the Cretaceous–Paleogene mass extinction},
  journal = {Science},
  year = {2019},
  doi = {10.1126/science.aay2268},
  url = {https://doi.org/10.1126/science.aay2268}
}