@Article{Richards_1985_7319,
  author = {Richards, W. A. and Hoffman, D. D.},
 journal = {Computer Vision, Graphics and Image Processing},
 number = {2},
 pages = {156-177},
 title = {Codon constraints on closed 2D shapes},
 volume = {31},
 year = {1985},
 title_with_no_special_chars = {Codon constraints on closed 2D shapes}
}