Horvath P, Jermyn I, Kato Z, Zerubia J. An Improved `Gas of Circles' Higher-Order Active Contour Model and its Application to Tree Crown Extraction. In: Kalra P, Peleg S, editors. Proceedings of Indian Conference on Computer Vision, Graphics and Image Processing (ICVGIP). Berlin; Heidelberg; New York: Springer Verlag; 2006. 1. p. 152-161p.