On the effective ω-rule

Warren D. Goldfarb. On the effective ω-rule. Math. Log. Q., 21(1):409-412, 1975. [doi]

@article{Goldfarb75,
  title = {On the effective ω-rule},
  author = {Warren D. Goldfarb},
  year = {1975},
  doi = {10.1002/malq.19750210155},
  url = {http://dx.doi.org/10.1002/malq.19750210155},
  researchr = {https://researchr.org/publication/Goldfarb75},
  cites = {0},
  citedby = {0},
  journal = {Math. Log. Q.},
  volume = {21},
  number = {1},
  pages = {409-412},
}