"Relying on population data of Hungary's town network, the authors review temporal and regional differences in urbanization. They trace back the data of 109 towns...[from] 1985 to the first official census of population, then they analyse by means of rank correlation the lags appearing in the concentration rate of urban population.... The authors think that urbanization of small towns might be the key element in the spatial and structural extension of urbanization. In the authors' opinion the lasting regional differences of urbanization determine also the centres of gravity of future development." (SUMMARY IN ENG AND RUS)