1. Bernard, M., Fromont, E., Habard, A., Sebban, M.: Hand Written Digit Recognition using Edit-Distance based KNN (2012)
2. Annapurna, P., Kothuri, S., Lukka, S.: Digit Recognition Using Freeman Chain Code. Published in International Journal of Application or Innovation in Engineering and Management (IJAIEM) 2(8) (August 2013)
3. Park, S.C., Choi, B.K.: Boundary Extraction Algorithm for Cutting Area Detection. Published in ElSEVIER on Computer Aided Design (2000)
4. Mich Digital Image Processing, 2nd edn. Gonzalez and Woods Pearson Publications
5. Chaudhari, P.P., Sardhe, K.: Handwritten Digits Recognition Special point. International Journal of Advanced Research in Computer Science and Software Engineering