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  1. Degrees of orderings not isomorphic to recursive linear orderings.Carl G. Jockusch & Robert I. Soare - 1991 - Annals of Pure and Applied Logic 52 (1-2):39-64.
    It is shown that for every nonzero r.e. degree c there is a linear ordering of degree c which is not isomorphic to any recursive linear ordering. It follows that there is a linear ordering of low degree which is not isomorphic to any recursive linear ordering. It is shown further that there is a linear ordering L such that L is not isomorphic to any recursive linear ordering, and L together with its ‘infinitely far apart’ relation is of low (...)
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  • Recursive isomorphism types of recursive Boolean algebras.J. B. Remmel - 1981 - Journal of Symbolic Logic 46 (3):572-594.
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  • Hiearchies of Boolean algebras.Lawrence Feiner - 1970 - Journal of Symbolic Logic 35 (3):365-374.
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  • Recursive Boolean algebras with recursive atoms.Jeffrey B. Remmel - 1981 - Journal of Symbolic Logic 46 (3):595-616.
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