M. A. Carnelossi, L. Lamounier, and M. A. Ranal, “Effect of light, sodium hypochlorite, scarification, and stratification on seed germination of lettuce (<i>Lactuca sativa</i> L), cv. "Maioba" and ‘Moreninha-de-Uberlândia’”, PAB, vol. 30, no. 6, pp. 779–787, Jun. 1995.