Sh:1132

Bib entry
@article{Sh:1132,
 author = {Saveliev, Denis I. and Shelah, Saharon},
 title = {{Ultrafilter extensions do not preserve elementary equivalence}},
 journal = {Mathematical Logic Quarterly},
 volume = {65},
 number = {4},
 year = {2019},
 pages = {511-516},
 doi = {10.1002/malq.201900045},
 note = {\href{https://arxiv.org/abs/1712.06198}{arXiv: 1712.06198}},
 arxiv_number = {1712.06198}
}