Vodop’yanov S. K., Isangulova D. V. 
          Differentiability of the mappings of Carnot-Caratheodory spaces 
          in the Sobolev and BV-topologies
        We prove differentiability of the mappings of the Sobolev classes and 
          BV-mappings of Carnot-Carathéodory spaces in the topology 
          of these classes. We infer from these results a generalization of the 
          Calderon-Zygmund theorems for mappings of the Carnot-Caratheodory spaces 
          and other facts.