VICHIAN LAOHAKOSOL; KANNIKA KONGSAKORN. Standard Forms and Derivatives of Arithmetic Functions. Agriculture and Natural Resources, Bangkok, Thailand, v. 26, n. 3, p. 307–309, 1992. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/241789. Acesso em: 18 sep. 2026.