1. Sur les fractions continues algébriques;de Montessus de Ballore;Bull. Soc. Math. France,1902
2. Die Lehre von den Kettenbrüchen;Perron,1929
3. The convergence of sequences of rational functions of best approximation with some free poles;Walsh,1965
4. Interpolation and approximation by rational functions in the complex domain;Walsh,1969