Bello, Omolaran B., et al. “GENOTYPIC VARIATION IN ENDOSPERM PROTEIN, LYSINE AND TRYPTOPHAN CONTENTS OF NORMAL EXTRA-EARLY MAIZE CULTIVARS AND THEIR QUALITY PROTEIN HYBRIDS UNDER NITROGEN STRESS AND NON-STRESS ENVIRONMENTS”. Journal of Research (Science), vol. 2223, no. 1-4, July 2025, pp. Pages: 27-48, http://jorscience.com/index.php/JRS/article/view/300.