D. Y. Zumba Morales, I. A. Villafuerte Montero, S. G. Llundo Michilena, and L. A. Granda Macías, “Detail quality of Upper Labial Frenulum on Alginate Impressions using cheek retractors”, Interamerican Journal of Health Sciences, vol. 4, p. 111, Jul. 2024, doi: 10.59471/ijhsc2024111.