Codon Constraints on Closed 2D Shapes. Richards, W A & Hoffman, D D Computer Vision Graphics and Image Processing, 32:265–281, 1985.
bibtex   
@article{richards_codon_1985,
	title = {Codon {Constraints} on {Closed} {2D} {Shapes}},
	volume = {32},
	journal = {Computer Vision Graphics and Image Processing},
	author = {Richards, W A and Hoffman, D D},
	year = {1985},
	pages = {265--281},
}

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