Sergey Dolgov, Boris N. Khoromskij, Ivan Oseledets & Eugene E. Tyrtyshnikov. (1970). Low-Rank Tensor Structure of Solutions to Elliptic Problems with Jumping Coefficients.
            <i>Journal of Computational Mathematics</i>. <i>30</i> (1).
            14-23.
         doi:10.4208/jcm.1110-m11si08