Karl Jug Daniel Wichmann MSINDO study of large silsesquioxanes. 1549-1553 2000 21 Journal of Computational Chemistry 16 http://dx.doi.org/10.1002/1096-987X(200012)21:16<1549::AID-JCC11>3.0.CO;2-J db/journals/jcc/jcc21.html#JugW00