Martin Kummer. A Note on Direct Sums of Friedbergnumberings. Journal of Symbolic Logic, 54(3):1009-1010, 1989.
@article{Kummer89, title = {A Note on Direct Sums of Friedbergnumberings}, author = {Martin Kummer}, year = {1989}, researchr = {https://researchr.org/publication/Kummer89}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {54}, number = {3}, pages = {1009-1010}, }