@article{10_1017_S0017089500009459,
     author = {Martindale, W. S. and Rosen, M. P.},
     title = {Extended centroids of power series rings},
     journal = {Glasgow mathematical journal},
     pages = {371--375},
     year = {1990},
     volume = {32},
     number = {3},
     doi = {10.1017/S0017089500009459},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009459/}
}