Hafez, H. A., Kovalev, S., Deinert, J.-C., Jan-Tielrooij, K., Bonn, M., Gensch, M., & Turchinovich, D. (2019). Graphene: The ultimate nonlinear material at terahertz frequencie. In Terahertz Science and Applications 2019. Washington, DC: OSA - The Optical Society. doi:10.1364/TSA.2019.TTu2G.1.