ANTONIO GILBERTO FERREIRA
UNIVERSIDADE FEDERAL DE S=C3O CARLOS
DEPARTAMENTO DE QU=CDMICA
Caixa Postal 676
13.565-905 S=E3o Carlos-SP
BRAZIL
telephone: 016 260 82 08
FAX:`016 260 83 50
e-mail: giba@dq.ufscar.br
Since now thank you very much for your kind attention