%0 Journal Article %A Martindale, W. S. %A Rosen, M. P. %T Extended centroids of power series rings %J Glasgow mathematical journal %D 1990 %P 371-375 %V 32 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009459/ %R 10.1017/S0017089500009459 %F 10_1017_S0017089500009459