Schlieren imaging: a powerful tool for atmospheric plasma diagnosticEnrico Traldi, Marco Boselli, Emanuele Simoncelli, Augusto Stancampiano, Matteo Gherardi, Vittorio Colombo and Gary S. SettlesEPJ Techn Instrum, 5 1 (2018) 4DOI: https://doi.org/10.1140/epjti/s40485-018-0045-1