D. NAGARAJA, N.R. PATIL, R. .A.KUSANUR, H.D. PATIL, and R. M. MELAVANKI. “PHOTO PHYSICAL PROPERTIES OF TWO COUMARIN DERIVATIVES USING SOLVATOCHROMIC SHIFT METHOD: Life Science-Spectroscopy”. International Journal of Life Science and Pharma Research, vol. 3, no. 1, Mar. 2013, pp. L54-L64, https://ijlpr.com/index.php/journal/article/view/317.