[1]
R. P. Nikolova, “Synthesis and structure of (<i>R,S</i>)-2-methyl-4-(4-nitrophenyl)-pyrano[3,2-c]chromen-5(4<i>H</i>)-one”, Maced. J. Chem. Chem. Eng., vol. 32, no. 2, pp. 239–250, Dec. 2012.