B.  Joseph, Caramazza, S., Capitani, F., Clarté, T., Ripanti, F., Lotti, P., Lausi, A., Di Castro, D., Postorino, P., and Dore, P., ?Coexistence of pressure-induced structural phases in bulk black phosphorus: A combined x-ray diffraction and Raman study up to 18 GPa?, Journal of Physics Condensed Matter, vol. 30, 2018.