The monadic theory of order. Shelah, S. Annals of Mathematics, 102:379–419, 1975.
bibtex   
@article{Sh:42,
author = {Shelah, Saharon},
ams-subject = {(02G05)},
journal = {Annals of Mathematics},
review = {MR 58:10390},
pages = {379--419},
title = {{The monadic theory of order}},
volume = {102},
year = {1975},
}

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