Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Wang, L, Perron, N, Tan, B, Dufresne, C, chen, S and Zhang, X(2022). In vitro phosphorylation assay and LC-MS/MS. Bio-protocol Preprint. bio-protocol.org/prep1623.
Wang, L., Yan, X., Li, Y., Wang, Z., Chhajed, S., Shang, B., Wang, Z., Choi, S. W., Zhao, H., Chen, S. and Zhang, X.(2022). PRP4KA phosphorylates SERRATE for degradation via 20S proteasome to fine-tune miRNA production in Arabidopsis. Science Advances 8(12). DOI: 10.1126/sciadv.abm8435