Helbrecht, Ilse, Éva Izsák, Peter Dirksmeier, Márton Berki, and Sebastian Schlueter. 2017. “The Changing Nature of Labour Protest: Comparing the Fragmentation of Protest Rituals on May 1st in Berlin and Budapest”. Hungarian Geographical Bulletin 66 (2), 95-111. https://doi.org/10.15201/hungeobull.66.2.1.