Al-Saif, A.M. et al. 2017. Preharvest Ethephon spray on fruit quality and increasing the rate of ripening of date palm fruit (Phoenix dactylifera L.) cv. Helali. Progress in Nutrition. 19, 1 (Apr. 2017), 97–103. DOI:https://doi.org/10.23751/pn.v19i1.4741.