Reflecting stationary sets and successors of singular cardinals. Shelah, S. Archive for Mathematical Logic, 31:25–53, 1991.
bibtex   
@article{Sh:351,
author = {Shelah, Saharon},
ams-subject = {(03E35)},
fromwhere = {IL},
journal = {Archive for Mathematical Logic},
review = {MR 93h:03072},
pages = {25--53},
title = {{Reflecting stationary sets and successors of singular
 cardinals}},
volume = {31},
year = {1991},
}

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