SOMSRI, B.; PIPATTANAJINDA, N. Algebraic Properties of Endomorphism Monoids on Barbell Graphs. Journal of Science and Technology CRRU, Chiangrai, Thailand, v. 5, n. 1, p. 33–42, 2026. Disponível em: https://li01.tci-thaijo.org/index.php/jstcrru/article/view/270687. Acesso em: 16 sep. 2026.