@article{CRCHIM_2012__15_6_530_0,
     author = {Masoud Mokhtary and Faranak Najafizadeh},
     title = {Polyvinylpolypyrrolidone-bound boron trifluoride {(PVPP-BF\protect\textsubscript{3});} a mild and efficient catalyst for synthesis of 4-metyl coumarins via the {Pechmann} reaction},
     journal = {Comptes Rendus. Chimie},
     pages = {530--532},
     publisher = {Elsevier},
     volume = {15},
     number = {6},
     year = {2012},
     doi = {10.1016/j.crci.2012.03.004},
     language = {en},
}