Murugadoss, K, and G Pasupathi. 2015. “Hardness Studies on Solution Grown Lithium Potassium Sulphate Single Crystals – An Inorganic Nonlinear Optical Material”. International Journal of Chemistry and Materials Research 3 (1):11-16. https://doi.org/10.18488/journal.64/2015.3.1/64.1.11.16.