NGUYEN TIEN KHIEM. A new approach to solution of the Focker-Plank-Kolmogorov equation tor random oscillatory nonlinear systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 8, p. 1123–1129, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8045. Acesso em: 5 dec. 2025.