Wang, S.; Song, J.; Wang, L.; Tomiyama, H.; Saito, T.; Ohkawa, K.; Ohara, H.; Yuhui, Z.; Srilaong, V.; Kondo, S. Effect of varying concentrations of melatonin on anthocyanin and sugar metabolism in grapes (Vitis labruscana L.). Agr. Nat. Resour. 2023, 57, 107–116.