Detecting contagious spreading of urban innovations on the global city network Niklas H. Kitzmann, Pawel Romanczuk, Nico Wunderling and Jonathan F. Donges Eur. Phys. J. Spec. Top., 231 9 (2022) 1609-1624 Published online: 21 February 2022 DOI: 10.1140/epjs/s11734-022-00470-4