1. 1.  Hui Deng, Feng Wang,Bo Liang, “A Low-cost OMR Solution for Educational Applications” International Symposium on parallel and Distributed Processing with Applications 2008 .
   2.  Parinya Sanguansat, “Robust and Low-cost Optical Mark Recognition for Automated Data Entry,” IEEE Transactions on, vol. 9, no. 1, pp. 62-66, 2015.
   3. Tien Dzung Nguyen, Quyet Hoang Manh, Phuong Bui Minh, Long Nguyen Thanh, Thang Manh Hoang,“Efficient and Reliable Camera based MultipleChoice Test Grading System,” IEEE International Conference on Advanced Technologies for Communications (ATC), 2011
   4.  A. AL-Marakeby “Multi-Core Processors for Camera based OMR”, International Journal of Computer Applications ( 0975 – 8887) Volume 68– No.13, 2013.
   5.  Sumit Tiwari, Sandeep Sahu “A Novel Approach for the Detection of OMR Sheet Tampering Using Encrypted QR Code” , 2014 IEEE International Conference on Computational Intelligence and Computing Research.