@article{Sumner:1999:ASM,
  doi = {10.1111/1467-8659.00299},
  title = {Animating Sand, Mud, and Snow},
  journal = {Computer Graphics Forum},
  author = {Robert W. Sumner and James F. O'Brien and Jessica K. Hodgins},
  number = 1,
  volume = 18,
  year = 1999,
  pages = {17--26},
  url = {https://objf.ai/papers/Sumner-ASM-1999-03/},
}