Whitehead groups may not be free, even assuming CH. II. Shelah, S. Israel Journal of Mathematics, 35:257–285, 1980.
bibtex   
@article{Sh:98,
author = {Shelah, Saharon},
ams-subject = {(03E35)},
journal = {Israel Journal of Mathematics},
review = {MR 82h:03055},
pages = {257--285},
title = {{Whitehead groups may not be free, even assuming CH. II}},
volume = {35},
year = {1980},
}

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