On the shadow of rotating traversable wormholes Galin Gyulchev, Petya Nedkova, Vassil Tinchev and Stoytcho Yazadjiev Eur. Phys. J. C, 78 7 (2018) 544 Published online: 03 July 2018 DOI: 10.1140/epjc/s10052-018-6012-9