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47A57 Operator methods in interpolation, moment and extension problems (2 articles)

• Appell, Jürgen; Simões, Marilda A.; Zabrejko, Petr P.: On the $\Cal L$-characteristic of fractional powers of linear operators. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 35 (1994), issue 1, pp. 21-34
• Hušek, Miroslav: Extensions of mappings from products. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 1, pp. 201