Coherent nonlinear optical response of single-layer black phosphorus: third-harmonic generation Vladimir A. Margulis, Evgeny E. Muryumin and Evgeny A. Gaiduk Eur. Phys. J. B, 90 11 (2017) 203 Published online: 01 November 2017 DOI: 10.1140/epjb/e2017-80420-1