Zubrilin, K. M. “P-Geodesic Transformations and Their Groups in Second-Order Tangent Bundles Induced by Concircular Transformations of Bases”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 3, Mar. 2009, pp. 346-64, https://umj.imath.kiev.ua/index.php/umj/article/view/3024.