Manuel Lerman. Some Nondistributive Lattices as Initial Segments of the Degrees of Unsolvability. Journal of Symbolic Logic, 34(1):85-98, 1969.
@article{Lerman69,
title = {Some Nondistributive Lattices as Initial Segments of the Degrees of Unsolvability},
author = {Manuel Lerman},
year = {1969},
researchr = {https://researchr.org/publication/Lerman69},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {34},
number = {1},
pages = {85-98},
}