Thanh, Nguyen, 		Hai, Do, 		Dung, Tran, 		Mai, Nguyen, AND 		Dang, Le.
" Study on the Use of the Ionic Liquid 1-butyl-3-methylimidazolium Hydroxide in Synthesis  of Substituted 4-aryl-4H-chromenes" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 32 Number 3 (15 September 2016)