Skrypnik, I. V. “On the Hölder Property for Functions from the Class $B_{q, s}$”.
Ukrains’kyi Matematychnyi Zhurnal
, vol. 45, no. 7, July 1993, pp. 1020–1028,
https://umj.imath.kiev.ua/index.php/umj/article/view/5895
.