V. G. Bondarenko, “Logarithmic derivatives of diffusion measures in a Hilbert space”, Ukr. Mat. Zhurn., vol. 52, no. 4, pp. 537–543, Apr. 2000, Accessed: Apr. 07, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4443