1. https://www.orientjchem.org/vol38no6/appraisal-of-vitamin-d3-concentration-in-dietary-supplement-marketed-in-bangladesh-using-hplc/
2. 1Institute of Food Science and Technology, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh.
3. 2BCSIR Rajshahi Laboratories, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh.
4. 3Pharmaceutical Sciences Research Division, BCSIR Laboratories Dhaka, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka-1205, Bangladesh.