MAHPARA, Shahzadi et al. 4. Nitrogen fertilization induced drought tolerance in sunflower: a review. Pure and Applied Biology (PAB), [S.l.], v. 8, n. 2, p. 1675-1683, june 2019. ISSN 2304-2478. Available at: <https://thepab.org/index.php/journal/article/view/952>. Date accessed: 12 nov. 2019.