Sultana, Sakina, Md Ohidullah, AHM Saifuddin, and Md Saddam Hossain. 2015. “Comparative Studies of Hydration Behaviour and Density of Pyrrolidone K-30, PEG 6000 and PEG 20000”. Bangladesh Pharmaceutical Journal 18 (1):48-52. https://doi.org/10.3329/bpj.v18i1.23515.