E. A. Carvalho, B. A. de Melo Neto, H. J. Holschuh, M. Franco, and C. K. do Sacramento, “Extraction and characterization of the pectin methylesterase (PME) of waste agroindustrial of the pineapple pearl”, Semina: Ciênc. Agrár., vol. 33, no. 6, pp. 2257–2266, Dec. 2012.