The Approximation of Solutions to Linear Homogeneous Differential Equations by Rational Functions. Charles Osgood (1980) Monatshefte für Mathematik
Tracking poles and representing Hankel operators directly from data. P.G. Spain, N.J. Young, J.W. Helton (1990/1991) Numerische Mathematik
Tres teoremas de aproximación en el espacio Lp mediante polinomios de coeficientes enteros. Emiliano Aparicio Bernardo (1977) Collectanea Mathematica
Truncation Error Bounds for Modified Continued Fractions with Applications to Special Functions. W.B. Jones, Christopher Baltus (1987) Numerische Mathematik