Warren D. Goldfarb, Harry R. Lewis. Skolem Reduction Classes. Journal of Symbolic Logic, 40(1):62-68, 1975.
@article{GoldfarbL75, title = {Skolem Reduction Classes}, author = {Warren D. Goldfarb and Harry R. Lewis}, year = {1975}, researchr = {https://researchr.org/publication/GoldfarbL75}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {40}, number = {1}, pages = {62-68}, }