INTERACTION BETWEEN Li+ CATION WITH CROWN ETHERS OF Bz15C5, DBz16C5 AND DBz18C6: MOLECULAR MODELING BASE ON MNDO/d SEMIEMPIRICAL METHOD - Pranowo, Harno Dwi; Austrian-Indonesian Centre for Computational Chemistry, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada , Yogyakarta (Universitas Gadjah Mada, 2010)