por Hehre, Warren J [autor] | Radom, Leo [autor] | Schleyer, Paul von R, 1930- [autor] | Pople, John A, 1925- [autor].
por Engel, Thomas, 1942- [autor] | Hehre, Warren J [colaborador] | Engel, Thomas, 1942-. Quantum chemistry and spectroscopy.