Mahmoodi, N.O., K. Tabatabaeian, M. Moghimi, and H. Mirmohammadi. 2016. “Utilizing 85% H2SO4 in One Pot Synthesis of 5-Mono- and 3,5-Disubstituted G-Butyrolactones”. Asian Journal of Chemistry 17 (4):2191-98. https://asianpubs.org/index.php/ajchem/article/view/13895.