A minimal extension that is not conservative.
Phillips, Robert G.
Michigan Math. J., Tome 20 (1974) no. 4, p. 27-32 / Harvested from Project Euclid
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Publié le : 1974-08-14
Classification:  02H20 
@article{1029001205,
     author = {Phillips, Robert G.},
     title = {A minimal extension that is not conservative.},
     journal = {Michigan Math. J.},
     volume = {20},
     number = {4},
     year = {1974},
     pages = { 27-32},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1029001205}
}

Phillips, Robert G. A minimal extension that is not conservative.. Michigan Math. J., Tome 20 (1974) no. 4, pp.  27-32. http://gdmltest.u-ga.fr/item/1029001205/