@article{ric-sha-sos-87-gauss,
  author = {B. Richter and H. Shank and S{\'o}stenes Lins},
  title = {The {Gauss} Code off the Plane},
  journal = {Aequationes Mathematicae},
  volume = {33},
  pages = {81--95},
  year = 1987
}