BerezanskyY. M., and PulemyotovA. D. “Spectral Theory and Wiener-Itô Decomposition for the Image of a Jacobi Field”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 59, no. 6, June 2007, pp. 744–763, https://umj.imath.kiev.ua/index.php/umj/article/view/3342.