Traceable Value for Proficiency Test of Natural Gas. Indonesian Journal of Science and Technology, [S. l.], v. 4, n. 2, p. 270–279, 2019. DOI: 10.17509/ijost.v4i2.18184. Disponível em: https://ijost.upi.edu/index.php/ijost/article/view/218. Acesso em: 21 oct. 2026.