1. and GAUSSIAN 88, Pittsburgh, PA, 1988.
2. and CADPAC, Cambridge Analytical Derivatives Package, issue 4, Cambridge, UK, 1988.
3. and GAMESS, Nat. Resour. Comput. Chem. Software Catalog, vol. 1, program 9901, 1980.
4. MOPAC, verson 5.0, program 455, Quantum Chemistry Program Exchange, Indiana University, Bloomington, IN.
5. Geometry optimization in cartesian coordinates: The end of theZ-matrix?