1. Christaller central place structure: an introductory statement;Alao,1977
2. A reformulation of classical location theory and its relation to rent theory;Alonso;Papers of the Regional Science Association,1967
3. A continuous model of transportation;Beckmann;Econometrica,1952
4. The partial equilibrium of a continuous space market;Beckmann;Weltwirtschaftliches Archiv,1953
5. Location theory;Beckmann,1968