Backward terahertz emission from two-color laser induced plasma sparkAleksandr Ushakov, Pavel Chizhov, Vladimir Bukin, Nikolay Panov, Daniil Shipilo, Olga Kosareva, Andrei Savel’ev and Sergey GarnovEPJ Web Conf., 195 (2018) 03010DOI: https://doi.org/10.1051/epjconf/201819503010