1. Solvent extraction for the chemical separations of the 5f elements
2. CERIUS2 , Molecular Simulations Inc. , San Diego , California , USA
3. Gaussian 94 (software). Revision Al , FRISCH , M.J. , TRUCKS , G.W. , SCHLEGEL , H.B. , GILL , P.M.W. , JOHNSON , B.G. , ROBB , M.A. , CHEESEMAN , J.R. , KEITH , T.A. , PETERSSON , G.A. , MONTGOMERY , J.A. , RAGHAVACHARI , K. , AL-LAHAM , M.A. , ZAKRZEWSKI , V.G. , ORTIZ , J.V. , FORESMAN J.B. , ClOSLOWSKI , J. , STEFANOV , B.B. , NANAYAKKARA , A. , CHALLALCOMBE , M. , PENG , C.Y. , AYALA , P.Y. , CHEN , W. , WONG , M.W. , ANDREWS , J.L. , REPLOGLE , E.S. , GOMPERTS , R. , MARTIN , R.L. , Fox , D.L. , BINKLEY , J.S. , DEFREES , D.J. , BAKER , J. , STEWART , J.P. , HEAD-GORDON , M. , GONZALEZ , C. , and POPLE , J.A. , Gaussian Inc. , Pittsburgh , PA , 1995