Josep Llados, Horst Bunke, & Enric Marti. (1996).**" Using cyclic string matching to find rotational and reflectional symmetric shapes" ** In H. B. H. N. R.C. Bolles (Ed.), _Dagstuhl Seminar on Modelling and Planning for Sensor–based Intelligent Robot Systems_. Saarbrucken (Germany).: World Scientific.