Helliwell, C.A., Chandler, P.M., Poole, A., Dennis, E.S. and Peacock, W.J. (2001). „The CYP88A cytochrome P450, ent-kaurenoic acid oxidase, catalyzes three steps of the gibberellin biosynthesis pathway”. Proc. Natl. Acad. Sci. USA98: 2065-2070. PMID11172076.