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      A parametrization for the symbols of a Hankel type operator 

      Bermudo Navarrete, Sergio; Marcantognini, Stefania A. M.; Morán, María Dolores (Editorial Universidad de Sevilla, 2005)
      Hankel operators and their symbols, as generalized by V. Pták and P. Vrbová, are considered. In this more general framework, ...