M. F. Barnsley, A. Sloan. Method and apparatus for processing digital data. United States Patent 5,065,447, 0.
@Misc{BaSl91,
Author = {Barnsley, M. F. and Sloan, A.},
Title = {Method and apparatus for processing digital data},
Howpublished = {United States Patent 5,065,447},
Year = {0}
}