Patel, M., Y. Saktawat, R. K. Nema, and R. K. Maheshwari. “New Spectrophotometric Method for the Estimation of Naproxen in Tablets Using N, N- Di Methyl Urea As Hydrotropic Agent”. Current Research in Pharmaceutical Sciences, Vol. 2, no. 3, Oct. 2012, pp. 177-9, https://crpsonline.com/index.php/crps/article/view/76.