See Nikolai Roskamm, Dichte: Eine transdisziplinäre Dekonstruktion (transcript, 2014); Doreen Massey, ‘On Space and the City’, in City Worlds, ed. Doreen Massey, John Allen and Steve Pile (Routledge, 1999), 151–74; Chris Brook, Gerry Mooney, and Steve Pile, Unruly Cities? Order/ Disorder (Routledge, 1999); Stephen Graham and Patsy Healey, ‘Relational Concepts of Space and Place’, European Planning Studies 7 (1999).