Hajime Ishihara. An omniscience principle, the König Lemma and the Hahn-Banach theorem. Math. Log. Q., 36(3):237-240, 1990. [doi]
@article{Ishihara90-0,
title = {An omniscience principle, the König Lemma and the Hahn-Banach theorem},
author = {Hajime Ishihara},
year = {1990},
doi = {10.1002/malq.19900360307},
url = {http://dx.doi.org/10.1002/malq.19900360307},
researchr = {https://researchr.org/publication/Ishihara90-0},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {36},
number = {3},
pages = {237-240},
}