On exact solution of the equation $u_{\small{00}}=u\Delta u$. Neliniini Kolyvannya, [S. l.], v. 1, n. 2, p. 3–7, 1998. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/19. Acesso em: 22 jan. 2026.