%0 Journal Article %A Phillips, John %A Raeburn, Iain %T Centre-valued Index for Toeplitz Operators with Noncommuting Symbols %J Canadian journal of mathematics %D 2016 %P 1023-1066 %V 68 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2015-038-7/ %R 10.4153/CJM-2015-038-7 %F 10_4153_CJM_2015_038_7