On preorders and prelattices:
Franco Montagna, Andrea Sorbi, Universal recursion theoretic properties of r.e. preordered structures, Journal of Symbolic Logic. 1985;50(2):397-406. [doi:10.2307/2274228]
Uri Andrews, Andrea Sorbi, Effective Inseparability, Lattices, and Preordering Relations, The Review of Symbolic Logic. 2021;14(4):838-865. [doi:10.1017/S1755020319000273]
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