LJUNGSTRÖM O., BERGLUND L., HJELMQUIST G., HUMBLE E., and ENGSTRÖM L. “Cyclic 3′,5′-AMP-Stimulated and Non-Stimulated Phosphorylation of Protein Fractions from Rat-Liver Cell Sap on Incubation With (γ-32P)ATP”. Upsala Journal of Medical Sciences, vol. 79, no. 3, Sept. 1974, pp. 129-37, doi:10.3109/03009737409178393.