Coherent nonlinear optical response of single-layer black phosphorus: third-harmonic generationVladimir A. Margulis, Evgeny E. Muryumin and Evgeny A. GaidukEur. Phys. J. B, 90 11 (2017) 203DOI: https://doi.org/10.1140/epjb/e2017-80420-1