M. A. Rajkumar, S. S. John Xavier, S. Anbarasu, and P. Devarajan, “Microhardness, Dielectric and Photoconductivity Studies of 2- Amino 5- Nitro Pyridinium Dihydrogen Phosphate (2A5NPDP) NLO Single Crystal”, ijetst, vol. 1, no. 10, Dec. 2014.