Bischofs, I. B., Hug, J. A., Liu, A. W., Wolf, D. M., & Arkin, A. P. (2009). Complexity
in bacterial cell-cell communication: Quorum signal integration and subpopulation signaling in the Bacillus subtilis phosphorelay. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 106(16),
6459-6464. doi:10.1073/pnas.0810878106.