Before revision: The first comprehensive study of cluster initiatives around the world was reported in the Cluster Initiative Greenbook published by Örjan Sölvell, Christian Ketels and Göran Lindqvist, with a foreword by Michael Porter.
After revision: ""The first comprehensive study of cluster initiatives around the world was reported in the Cluster Initiative Greenbook published by Örjan Sölvell, Christian Ketels and Göran Lindqvist, with a foreword by Michael Porter.