Bianping, Su, and Shichang Shu. 2012. “Conformal Isoparametric Spacelike Hypersurfaces in Conformal Spaces $\mathbb{Q}^4_1$ and $\mathbb{Q}^5_1$”. Ukrains’kyi Matematychnyi Zhurnal 64 (4), 557-70. https://umj.imath.kiev.ua/index.php/umj/article/view/2595.