1. “Basic Pathology” by Kumar, Cotran, Robbins 6th edition; Published by Harcourt Asia Saunders; Reference pages 345-347.
2. “Davidson‘s Principles and Practice of Medicine” 20th edition; Published by Churchill Livingstone (Elsiever); Edited by Nicholas A. Boon, Nicki R. Colledge, Brian R. Walker, John A.A. Hunter; Reference pages 1035-1037.
3. “Review of Medical Physiology” by William F. Ganong (International edition); 18th edition; Published by Prentice-Hall International, Inc. Reference page 499.
4. www.mathworks.com/matlabcentral/fileexchange/9303-sobel-edge-detection.
5. “Study and Comparison of Various Image Edge Detection Techniques” by Raman Maini, Dr. Himanshu Aggarwal .