“Effect of Ultrasonic Treatment Time and Concentration of Citric Acid and Salt (NaCl) on the Activity of Polyphenoloxidase in Avocado Pulp (Persea Americana Var Mill. Hass)”. Tecnología & Desarrollo (Trujillo), vol. 12, no. 1, Dec. 2014, pp. 51-58, https://doi.org/10.18050/td.v12i1.691.