1. Christaller central place structures: an introductory statement;Alao;Northwestern University Studies in Geography,1977
2. Urban evolution, self-organization and decision-making;Allen;Environment and Planning,1981
3. Mathematical structure in human affairs;Atkin,1974
4. Combinatorial connectivities in social systems;Atkin,1977
5. Multidimensional man;Atkin,1981