Nikpassand, M., L. Zare Fekri, Z. Gharib, and Z. Jafarian. “POTASSIUM 2-OXOIMIDAZOLIDINE-1,3-DIIDE AS A NOVEL CATALYST FOR GRIND SYNTHESIS OF PYRANO[4,3-b]CHROMENONE”. Journal of the Chilean Chemical Society, Vol. 63, no. 4, Jan. 2019, https://jcchems.com/index.php/JCCHEMS/article/view/915.