1. Pattern Classification and Scene Analysis;Duda,1973
2. Machine Perception of Three Dimensional Objects, Optical and Electro Optical Information Processing;Roberts,1965
3. Picture thresholding using an iterative selection method;Ridler;IEEE Trans. Systems, Man Cybernet SMC-8,1978
4. J.F. Haddon, Scene analysis of digital infrared images: the segmentation and recognition of distributed entities. A transfer report, M.Phil to Ph.D., University of Surrey, Guildford/Royal Aircraft Establishment, Farnborough.borough.
5. Theory and Problems of Statistics in SI units;Spiegel,1972