@article{MZ_1975__145_172279,
     author = {M.R.F. Smyth and T.T. West},
     title = {The {Spectral} {Radius} {Formula} in {Quotient} {Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {157--162},
     publisher = {mathdoc},
     volume = {145},
     year = {1975},
     zbl = {0299.46046},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__145_172279/}
}