Bala Karuna Kumar, D., K. Rayapa Reddy, G. Srinivasa Rao, G.V. Rama Rao, and C. Rambabu. 2012. “Theoretical Evaluation and Comparative Study of Ultrasonic Velocities in Binary Liquid Mixtures of N-Methyl-2-Pyrrolidone With Substituted Benzenes at Different Temperatures and Atmospheric Pressure”. Asian Journal of Chemistry 24 (5):2239-44. https://asianpubs.org/index.php/ajchem/article/view/8992.