1. Trigonometric Series, I, II;Zygmund,1959
2. Treatise on Trigonometric Series;Bari,1964
3. On the class of functions with absolutely convergent Fourier series;Chen,1928
4. The absolute convergence of Fourier series;Chen;Duke Math. J.,1942
5. On the class of Young's continuous functions II;Yadav;Mat. Vesnik,1965