Freitas, I. L. de J.; Rodrigues, W. P.; Amaral Junior, A. T.; Freitas, S. P.; Amim, R. T.; Vittorazzi, C.; Freitas, J. A. A. Maximum Quantum Yield of Photosystem II to Assist in the Measurement of Herbicide Selectivity in Popcorn. Plant Sci. Today 2014, 1, 80-85.