LitovchenkoV. A. “Analogs of <i>S</I&gt;-Type Spaces of Partially Even Functions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 65, no. 4, Apr. 2013, pp. 512-21, https://umj.imath.kiev.ua/index.php/umj/article/view/2435.