Before revision: In that field, Cluster Theory (Porter, 1990) evolved in more environmentally sensitive theories, like Industrial Ecology (Frosh and Gallopoulos, 1989) and Industrial Symbiosis (Chertow, 2000)
After revision: In that field, cluster theory (Porter, 1990) evolved in more environmentally sensitive theories, like industrial ecology (Frosh and Gallopoulos, 1989) and industrial symbiosis. (Chertow, 2000)