Takashi Sato. Reverse mathematics and Isbell's zig-zag theorem. Math. Log. Q., 60(4-5):348-353, 2014. [doi]
@article{Sato14a, title = {Reverse mathematics and Isbell's zig-zag theorem}, author = {Takashi Sato}, year = {2014}, doi = {10.1002/malq.201300071}, url = {http://dx.doi.org/10.1002/malq.201300071}, researchr = {https://researchr.org/publication/Sato14a}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {60}, number = {4-5}, pages = {348-353}, }