Fernandes, Adriano Alves, et al. “Successively Cultivated Tomato Plants Originated from Seeds and Vegetative Propagation in Hydroponic System”. Pesquisa Agropecuaria Brasileira, vol. 42, no. 7, July 2007, pp. 1013-9, doi:10.1590/S1678-3921.pab2007.v42.7660.