A CASSCF/MRCI study of the low-lying electronic states of the 'BE''S' molecule - Oliveira Filho, Antonio Gustavo Sampaio de; Alves, Tiago Vinicius; Ribas, Vladir Wagner; Ferrão, Luiz F. A; Roberto Neto, Orlando; Machado, Francisco Bolivar Correto; Ornellas, Fernando Rei (International Journal of Quantum Chemistry, 2011)