1. PARAPIC language definition, version 2.1;Blake,1982
2. Relaxation labelling — the principle of ‘least disturbance’;Blake;Patt. Recogn. Lett.,1983
3. Definition of a consistent labelling as a global extremum;Berthod,1982
4. Review of the CLIP;Duff,1978
5. Segmentation of natural scenes;Hanson,1978