%0 Journal Article %T On the Polymorphism of 12-Tungstoborate Heteropolyanion: Structure Determination and Its Functionalization with L-proline %A Arefian, Mina %A Mirzaei Shahrabi, Masoud %A Eshtiagh Hosseini, Hossein %J Journal of the Iranian Chemical Society %@ 1735-207X %D 2017