Rupinder Kaur Dhamoon, Harvinder Popli, Geeta Aggarwal, and Madhu Gupta. “Particle Size Characterization- Techniques, Factors and Quality-by-Design Approach”. International Journal of Drug Delivery, vol. 10, no. 1, Mar. 2018, pp. 1-11, https://ijdd.arjournals.org/index.php/ijdd/article/view/318.