1. B. Basavaprasad, R.S. Hegadi, A survey on traditional and graph theoretical techniques for image segmentation. Int. J. Comput. Appl. (Recent Adv. Inform. Technol.) 1, 38–46 (2014)
2. G. Carlsson, Topology and data. Bull. (New Ser.) Am. Math. Soc. 46(2), 255–308 (2009). doi:10.1090/s0273-0979-09-01249-x
3. L. Chen, The necessary and sufficient condition and the efficient algorithms for gradually varied fill. Chin. Sci. Bull. 35, 10 (1990). Abstracts of SIAM Conference on Geometric Design, Temple, AZ, 1989
4. L. Chen, The lambda-connected segmentation and the optimal algorithm for split-and-merge segmentation. Chin. J. Comput. 14, 321–331 (1991)
5. L. Chen, Gradually varied surface and its optimal uniform approximation (IS&T/SPIE Symposium on Electronic Imaging). SPIE Proc. 2182, 300–307 (1994)