Shravan Kumar Yadav1 , Dr V. Vasu. 2016. “Synthesis and Characterization of Copper Nanoparticles, Using Combination of Two Different Sizes of Balls in Wet Ball Milling”. International Journal of Emerging Trends in Science and Technology 3 (04), 3795-99. http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1052.