1. Hierarchical diffusion: the basis of developmental filtering and spread in a system of growth centers;Berry,1972
2. L’espace et les pôles de croissance. Recherches et textes fondamentaux,1968
3. Growth poles and growth centers in regional planning – a review;Darwent;Environ. Plan.,1969
4. La géographie active;George,1964
5. Growth Centres in the European Urban System,1980