The summability by logarithmic means of the ultra-spherical series. B. C. Singhai — 1962 Bollettino dell'Unione Matematica Italiana
On the Cesàro summability of the ultraspherical series. B. C. Singhai — 1961 Bollettino dell'Unione Matematica Italiana
Approximation to the generating function by the Cesàro means of its ultraspherical series. B. C. Singhai — 1962 Bollettino dell'Unione Matematica Italiana