Tiznado-Hernández, M.-E., J. Gaffe, and A. K. Handa. “Isolation and Study of a Ubiquitously Expressed Tomato Pectin Methylesterase Regulatory Region”. Electronic Journal of Biotechnology, vol. 7, no. 1, Apr. 2004, pp. 0-0, https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v7n1-1.