{"identifier":"nobleid:/w1/20260521/B2EBAC91","arkIdentifier":"ark:/48914/w1/20260521/B2EBAC91","version":1,"workTitle":"Introduction","workType":"Journal Article","authors":"Peter Nijkamp, Piet Rietveld","description":null,"workUrl":null,"existingDoi":"10.1016/0166-0462(83)90002-9","createdAt":"2026-05-21T20:13:52.047544Z","canonicalUrl":"https://nobleid.org/ark:/48914/w1/20260521/B2EBAC91.v1"}