A novel technique to initiate and investigate scroll waves in thin layers of the photosensitive Belousov-Zhabotinsky reactionArash Azhand, Rico Buchholz, Jan F. Totz and Harald EngelEur. Phys. J. E, 39 6 (2016) 61DOI: https://doi.org/10.1140/epje/i2016-16061-2