Role of abscisic acid in chilling tolerance of rice (Oryza sativa L.) seedlings. I. Endogenous abscisic acid levels
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-3040.1993.tb00895.x
The effects of drought stress on yield, relative water content, proline, soluble carbohydrates and chlorophyll of bread wheat cultivars
http://m.elewa.org/JAPS/2010/8.3/4.pdf
