1. K. I. Babenko, Approximation by trigonometric polynomials in a certain class of periodic functions of several variables, Dokl. Akad.Nauk SSSR 132 (1960), 982–985 (Russian). – English transl. in Soviet Math. Dokl. 1 (1960), 672–675.
2. K.I. Babenko, On the Mean Convergence of Multiple Fourier Series and the Asymptotics of the Dirichlet Kernel of Spherical Means, Inst. Prikl. Mat. Akad. Nauk SSSR, Moscow, Preprint No.52, 1971 (Russian).
3. G. Bateman and A. Erdélyi, Higher Transcendental Functions, Vol. II, McGraw Hill Book Company, New York, 1953.
4. H. Bateman and A. Erdélyi , Tables of integral transforms, Vol. I, McGraw Hill Book Company, New York, 1954.
5. E. Belinsky, Behavior of the Lebesgue constants of certain methods of summation of multiple Fourier series, Metric Questions of the Theory of Functions and Mappings, Naukova Dumka, Kiev, 1977, 19–39 (Russian).