Paul E. Cohen. Some Continuity Properties for Ultraproducts. Math. Log. Q., 24(19-24):319-321, 1978. [doi]
@article{Cohen78-4, title = {Some Continuity Properties for Ultraproducts}, author = {Paul E. Cohen}, year = {1978}, doi = {10.1002/malq.19780241906}, url = {http://dx.doi.org/10.1002/malq.19780241906}, researchr = {https://researchr.org/publication/Cohen78-4}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {24}, number = {19-24}, pages = {319-321}, }