A very old paper by Yura, K. et al on Protein Engineering is cited by Park, H., et al (2020) on Frontiers in Plant Science.

Yura, K., Tomoda, S., and Go, M. “Repeat of a helix-turn-helix module in DNA-binding proteins” in 1993 on Protein Engineering is cited in the manuscript “A LysR-Type Transcriptional Regulator LcrX Is Involved in Virulence, Biofilm Formation, Swimming Motility, Siderophore Secretion, and Growth in Sugar Sources in Xanthomonas axonopodis Pv. glycines” by Park, H., Do, E., Kim, M., Park, H-J., Lee, J., Han, S-W on Frontiers in Palan Science.