1. N-variable rational approximants;Chisholm,1977
2. Abstract Padé Approximants in Operator Theory;Cuyt,1979
3. On the properties of abstract rational (1-point) approximants;Cuyt;J. Oper. Theory,1981
4. General rational approximants in N-variables;Jones;J. Approx. Theory,1976
5. Rational approximation by an interpolation procedure in several variables;Karlsson,1977