On the Existence of Optimal Unions of Subspaces for Data Modeling and Clustering.

Akram Aldroubi Romain Tessera On the Existence of Optimal Unions of Subspaces for Data Modeling and Clustering. 363-379 2011 11 Foundations of Computational Mathematics 3 http://dx.doi.org/10.1007/s10208-011-9086-4 db/journals/focm/focm11.html#AldroubiT11