L. . Aguilar-Sánchez, M. T. . Martínez-Damián, A. F. . Barrientos-Priego, N. . Aguilar-Gallegos, and C. . Gallegos-Vásquez, “Enzymatic Browning Potential of ‘Nopalitos’ Varieties”, J PROF ASSOC CACTUS, vol. 9, pp. 165–184, Dec. 2007.