C. Antonio Patto Pacheco, E. Eugenio Gomes e Gama, P. Evaristo de Oliveira Guimarães, M. Xavier dos Santos, and A. da Silva Ferreira, “Genetic parameters estimatives in CMS-42 and CMS-43 popcorn populations”, PAB, vol. 33, no. 12, pp. 1995–2001, Dec. 1998.