Greiner, W. [P:(DE-HGF)0] ; Ruffini, R. J. [P:(DE-HGF)0] ; Stoecker, Horst [P:(DE-Ds200)OR2345] ; Coelho, H. T. [P:(DE-HGF)0] ; Prado, S. D. [P:(DE-HGF)0] ; Vasconcellos, C. A. Z. [P:(DE-HGF)0]