Fei, C., S. Mao, J. Yan, R. Alert, H. A. Stone, B. L. Bassler, N. S. Wingreen, and A. Košmrlj. (2020) 2020. “Nonuniform Growth and Surface Friction Determine Bacterial Biofilm Morphology on Soft Substrates”. Proc Natl Acad Sci U S A 117: 7622-32.