UTSANEE LEERAWAT; VICHIAN LAOHAKOSOL. Symbolic Integration for Line Integrals II. Agriculture and Natural Resources, Bangkok, Thailand, v. 27, n. 3, p. 376–381, 1993. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/241578. Acesso em: 17 sep. 2026.