Malek-Shahmirzadi, Massoud (1983). "A characterization of certain classes of matrix norms". Linear and Multilinear Algebra. 13 (2): 97–99. doi:10.1080/03081088308817508. ISSN0308-1087.
Ding, Chris; Zhou, Ding; He, Xiaofeng; Zha, Hongyuan (June 2006). R1-PCA: Rotational invariant L1-norm principal component analysis for robust subspace factorization. 23rd International Conference on Machine Learning. ICML '06. Pittsburgh, PA: Association for Computing Machinery. pp. 281–288. doi:10.1145/1143844.1143880. ISBN1-59593-383-2.
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Malek-Shahmirzadi, Massoud (1983). "A characterization of certain classes of matrix norms". Linear and Multilinear Algebra. 13 (2): 97–99. doi:10.1080/03081088308817508. ISSN0308-1087.
Horn, Roger A. (2012). Matrix analysis. Johnson, Charles R. (2nd ed.). Cambridge, UK: Cambridge University Press. pp. 340–341. ISBN978-1-139-77600-4. OCLC817236655.