1. A reverse Hadamard inequality;Ambikkumar;Linear Algebra Appl,1996
2. Sur les matrices hypohermitiennes et les unitairs;Autonne;Compt. Rend. Acad. Sci,1913
3. Completely Positive Matrices;Berman,2003
4. M. Cooper, J. Foote, Summarizing video via similarity matrix decomposition, in: Proceedings of IEEE Workshop on Multimedia Signal Processing, 2002
5. Orthogonal bases which lead to symmetric nonnegative bases;Elsner;Linear Algebra Appl,1998