Grigoreva TI. Invariant Geometric Objects of the Canonical Almost-Geodesic Mapping π<sub class="a-plus-plus">2</sub> (<em class="a-plus-plus">e</em> = 0). Ukr. Mat. Zhurn. [Internet]. 2002Oct.25 [cited 2024Jul.27];54(10):1329-35. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4171