HelbrechtI., Izsák Éva, DirksmeierP., BerkiM., & SchlueterS. (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