Harding MM, Hodgkin DC, Kennedy AF, O'Conor A, Weitzmann PD (March 1966). "The crystal structure of insulin. II. An investigation of rhombohedral zinc insulin crystals and a report of other crystalline forms". Journal of Molecular Biology. 16 (1): 212–26. doi:10.1016/S0022-2836(66)80274-7. PMID5917731.
Harding MM, Hodgkin DC, Kennedy AF, O'Conor A, Weitzmann PD (March 1966). "The crystal structure of insulin. II. An investigation of rhombohedral zinc insulin crystals and a report of other crystalline forms". Journal of Molecular Biology. 16 (1): 212–26. doi:10.1016/S0022-2836(66)80274-7. PMID5917731.