Combarro E. F.
          On classifying subsets of natural numbers by their computable 
          permutations
        We introduce some alternative definitions of the concept of computable 
          automorphism of a set of natural numbers. We study their relationships 
          and investigate whether some classes of sets having isomorphic groups 
          of automorphisms coincide with other classes of sets usual in computability. 
          Finally, we show that the classification of sets by these groups of 
          automorphisms is nontrivial.