1. N. I. Akhiezer, Lectures on Approximation Theory [in Russian], Nauka, Moscow (1965).
2. K. I. Babenko, “On a new quasi-analyticity problem and the Fourier transform of entire functions,” Trudy Mosk. Mat. Obshch., 5, 523–542 (1956).
3. K. I. Babenko, “On certain classes of spaces of infinitely differentiable functions,” Dokl. Akad. Nauk SSSR, 132, No.6, 1231–1234 (1960).
4. E. Beller, “Zeros of A p functions and related classes of analytic functions,” Israel J. Math., 22, 68–80 (1975).
5. R. P. Boas, Entire Functions, Academic Press, New York (1954).