Zainalov, B. R. “First Nontrivial Group of Homologies of Simplicial Schemes of Unimodular Frames over the Dedekind Ring”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 9 (September 25, 2018): 1231–1248. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1630.