Did you mean: Rydberg, Richard M.
  1.  21 DLs
    Richard M. Friedberg (1958). Three Theorems on Recursive Enumeration. I. Decomposition. II. Maximal Set. III. Enumeration Without Duplication. Journal of Symbolic Logic 23 (3):309-316.
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  2.  1 DLs
    Richard M. Friedberg & Hartley Rogers (1959). Reducibility and Completeness for Sets of Integers. Mathematical Logic Quarterly 5 (7‐13):117-125.
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