@misc{indiciae7e0e3bbfb159,
  title = {Planetesimals to planets - Numerical simulation of collisional evolution},
  author = {Greenberg, R. and Hartmann, W. K. and Chapman, C. R. and Wacker, J. F.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780065053},
  note = {Source identifier: 19780065053}
}