GolubovB. I., and VolosivetsS. S. “Fourier Cosine and Sine Transforms and Generalized Lipschitz Classes in Uniform Metric”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 64, no. 5, May 2012, pp. 616-27, http://umj.imath.kiev.ua/index.php/umj/article/view/2602.