GrigorevaT. I. (2002) “Invariant Geometric Objects of the Canonical Almost-Geodesic Mapping π<sub class="a-plus-plus">2</sub> (<em class="a-plus-plus">e</em&gt; = 0)”, Ukrains’kyi Matematychnyi Zhurnal, 54(10), pp. 1329-1335. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4171 (Accessed: 27July2024).