Alan M. Turing. The Ø-Function in lambda-K-Conversion. Journal of Symbolic Logic, 2(4):164, 1937.
@article{Turing37a, title = {The Ø-Function in lambda-K-Conversion}, author = {Alan M. Turing}, year = {1937}, researchr = {https://researchr.org/publication/Turing37a}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {2}, number = {4}, pages = {164}, }