Libardi, Alice Kimie Miwa, and V. V. Sharko. 2014. “Functions and Vector Fields on $C(ℂP^N)$-Singular Manifolds”. Ukrains’kyi Matematychnyi Zhurnal 66 (3), 311–315. https://umj.imath.kiev.ua/index.php/umj/article/view/2134.