Galba, E. F., Deineka, V. S., & Sergienko, I. V. (2015). Necessary and Sufficient Conditions for the Existence of Weighted Singular-Valued Decompositions of Matrices with Singular Weights. Ukrains’kyi Matematychnyi Zhurnal, 67(3), 406–426. Retrieved from http://umj.imath.kiev.ua/index.php/umj/article/view/1992