SCHRIPSEMA, J. ACCURATE QUANTIFICATION OF PURE OR IMPURE SUBSTANCES IN THE MICRO- TO MILLIGRAM RANGE BY 1H-NMR. African Journal of Traditional, Complementary and Alternative Medicines, [S. l.], v. 6, p. 491, 2009. Disponível em: https://athmsi.org/journals/index.php/ajtcam/article/view/953. Acesso em: 1 feb. 2025.