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3. F. Nevanlinna and R. Nevanlinna, “Über die Eigenschaften einer analytischen Funktionen in der Umgeburg einer singularen Stille oder Linie,” Acta Soc. Sc. Fennicae 50 (5), 1–46 (1922).
4. V. V. Arestov, “The uniform regularization of the problem of computing the values of an operator,” Mat. Zametki 22 (2), 231–244 (1977) [in Russian].
5. C. A. Micchelli and T. J. Rivlin, “A survey of optimal recovery,” in Optimal Estimation in Approximation Theory (Plenum Press, New York, 1977), pp. 1–54.