Rharrabti Y, Elhani S, Martos-Núñez V, García Del Moral LF. Protein and lysine content, grain yield, and other technological traits in durum wheat under Mediterranean conditions. J Agric Food Chem. 2001 Aug;49(8):3802–7. doi: 10.1021/jf001139w. PMID: 11513670.