Edlund B., Heldin C. H., and Engström L. “Effect of Chemical Modification of a Histidine and a Lysine Residue of Pea Seed Nucleoside Diphosphate Kinase”. Upsala Journal of Medical Sciences, vol. 87, no. 3, Sept. 1982, pp. 243-50, doi:10.3109/03009738209178429.