Utsanee Leerawat, Vichian Laohakosol. Symbolic Integration for Line Integrals II. Agr. Nat. Resour. [internet]. 1993 Mar. 31 [cited 2026 Sep. 17];27(3):376-81. available from: https://li01.tci-thaijo.org/index.php/anres/article/view/241578