Mai, Nguyen, 		Thuy, Nguyen, AND 		Thanh, Nguyen.
" Study on Synthesis of Some 6-butoxy-4-(Substituted Imino Methyl)-2H-chromen-2-ones under Solvent-free Conditions" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 32 Number 3 (15 September 2016)