On the strong Nörlund summability of conjugate Fourier seriesMadan Lal Mittal, Uaday Singh, Vishnu Narayan MishraApplied Mathematics and Computation2007

Trigonometric Approximation of Signals (Functions) Belonging to W(Lr, 𝜉(t)) Class by Matrix (C1·Np) OperatorUaday Singh, Madan Lal Mittal, Smita SonkerInt. J. Math. Mathematical Sciences2012

Approximation of signals of class Lip(alpha, p) by linear operatorsMadan Lal Mittal, B. E. Rhoades, Smita Sonker, Uaday SinghApplied Mathematics and Computation2011

Approximation of conjugate of functions belonging to weighted Lipschitz class W(Lp, ξ(t)) by Hausdorff means of conjugate Fourier seriesUaday Singh, Shailesh Kumar SrivastavaJ. Computational Applied Mathematics2014

Trigonometric approximation of periodic functions belonging to Lip(ω(t), p)-classShailesh Kumar Srivastava, Uaday SinghJ. Computational Applied Mathematics2014

T * C1 summability of a sequence of Fourier coefficientsMadan Lal Mittal, Uaday SinghApplied Mathematics and Computation2008