@article{Eriksson1990,
    author = {Folke Eriksson},
    title = {On the Measure of Solid Angles},
    journal = {Mathematics Magazine},
    volume = {63},
    number = {3},
    pages = {184--187},
    year = {1990},
    publisher = {Taylor \& Francis},
    doi = {10.1080/0025570X.1990.11977515},
    URL = {https://doi.org/10.1080/0025570X.1990.11977515},
    eprint = {https://doi.org/10.1080/0025570X.1990.11977515}
}
@article{Goh2017,
  author = {Goh, Gabriel},
  title = {Why Momentum Really Works},
  journal = {Distill},
  year = {2017},
  url = {http://distill.pub/2017/momentum},
  doi = {10.23915/distill.00006}
}
