机译:反馈切换控制的增强BV设置
Department Mathematik Lehrstuhl f(u)r Angewan(a)te Mathematik Ⅱ Universitat Erlangen-N(u)rnberg Martensstr. 3 91058 Erlangen Germany.;
Department of Mathematics and Statistics University of Maryland Baltimore County Baltimore MD 21250 USA.;