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  1. Some nondistributive lattices as initial segments of the degrees of unsolvability.Manuel Lerman - 1969 - Journal of Symbolic Logic 34 (1):85-98.
  • Embedding Lattices with Top Preserved Below Non‐GL2 Degrees.Peter A. Fejer - 1989 - Mathematical Logic Quarterly 35 (1):3-14.
  • Embedding Lattices with Top Preserved Below Non-GL2 Degrees.Peter A. Fejer - 1989 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 35 (1):3-14.