no. 4
An extension to rational functions of a theorem of J. L. Walsh on differences of interpolating polynomials
RAIRO. Analyse numérique, Tome 15 (1981) no. 4, pp. 371-390 
@article{M2AN_1981__15_4_371_0,
     author = {Saff, E. B. and Sharma, A. and Varga, R. S.},
     title = {An extension to rational functions of a theorem of {J.} {L.} {Walsh} on differences of interpolating polynomials},
     journal = {RAIRO. Analyse num\'erique},
     pages = {371--390},
     year = {1981},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {15},
     number = {4},
     mrnumber = {642498},
     zbl = {0485.41003},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1981__15_4_371_0/}
}
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Saff, E. B.; Sharma, A.; Varga, R. S. An extension to rational functions of a theorem of J. L. Walsh on differences of interpolating polynomials. RAIRO. Analyse numérique, Tome 15 (1981) no. 4, pp. 371-390. https://www.numdam.org/item/M2AN_1981__15_4_371_0/

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