Fundamental solutions of the Cauchy problem for invariant $\Lambda(\mu)$-hyperbolic operators on Riemannian manifolds. Neliniini Kolyvannya, [S. l.], v. 8, n. 2, p. 224–233, 2005. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/349. Acesso em: 22 jan. 2026.