F. Bered, M. J. Cruz de Melo Sereno, F. I. Félix de Carvalho, C. Erna Lange, C. Luise Handel, and A. L. Cunha Dornelles, “Plant regeneration from embryogenic and organogenic calli in oat”, PAB, vol. 33, no. 11, pp. 1827–1833, Nov. 1998.