de Carvalho, Edson Ferreira, and Nei Fernandes Lopes. 1994. “Growth and Solar Energy Conversion in <i>Azolla< i> Spp. Grown under Four Solar Radiation Levels”. Pesquisa Agropecuaria Brasileira 29 (2):211-20. https://doi.org/10.1590/S1678-3921.pab1994.v29.4046.