Dispersive liquid-liquid microextraction/HPLC techniques for determination of oxytetracycline and doxycycline residues in beef samples: method developments and statistical analysis. African Scientific Reports, [S. l.], v. 2, n. 1, p. 87, 2023. DOI: 10.46481/asr.2023.2.1.87. Disponível em: https://asr.nsps.org.ng/index.php/asr/article/view/87.. Acesso em: 2 may. 2024.