1. Yassen MY, Barringer SA, Splittstoesser WE, Constanza S. The role of seed coat in seed viability. The Botanical Review. 1994;60(4):426-439
2. Esau K. Anatomía de las plantas con semillas. Buenos Aires, Argentina: Hemisferio Sur; 1987. 512 pp
3. Bewly J, Black M. Seeds. Physiology of Development and Germination. v 2. New York: Pleum Press; 1986. pp. 182
4. Besnier RF. Semillas Biología y Tecnología. Madrid: Mundiprensa; 1989. 637 pp
5. Mc Kee GW, Pfeiffer RA, Mosheninn NN. Seed coat impermeability to water. Agronomy Journal. 1977;69:53-58