A compactness theorem for singular cardinals, free algebras, Whitehead problem and transversals. Shelah, S. Israel Journal of Mathematics, 21:319–349, 1975.
bibtex   
@article{Sh:52,
author = {Shelah, Saharon},
ams-subject = {(02H13)},
journal = {Israel Journal of Mathematics},
review = {MR 52:10410},
pages = {319--349},
title = {{A compactness theorem for singular cardinals, free algebras,
 Whitehead problem and transversals}},
volume = {21},
year = {1975},
}

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