Fatimah, Fatimah, et al. «Synthesis of Manganese Nanoparticles of Oolong Tea Extract by Sonication Method for a Natural Oral Contrast Media on Magnetic Resonance Cholangiopancreatography». Gaceta Médica De Caracas, vol. 130, n.º 5S, noviembre de 2022, http://caelum.ucv.ve/ojs/index.php/rev_gmc/article/view/25012.