Botyuk, A. O., G. P. Khoma, and L. G. Khoma. 1997. “Existence of the Vejvoda-Shtedry Spaces”. Ukrains’kyi Matematychnyi Zhurnal 49 (2): 302–308. https://umj.imath.kiev.ua/index.php/umj/article/view/5007.