Ibrahim, M. A. (2010) “Novel heterocyclic derivatives of pyrano[3,2-c]quinolinone from 3-(1-ethy1-4-hydroxy-2-oxo-2(1H)-quinolin-3-yl)-3-oxopropanoic acid”, European Journal of Chemistry, 1(3), pp. 195–199. doi: 10.5155/eurjchem.1.3.195-199.91.