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Indicator kilometric rutier al Republicii Socialiste România
Savu, Dragoş, (1974)
A hypothesis about gateway cities
Burghardt, A. F., (1971)
Distance concepts in socio-economic space analysis
Chojnicki, Zbyszko, (1970)
Oltenia, Muntenia, Dobrogea, Moldova
Gheorghiu, Cezar Al. Gh., (1975)
Maramureş, Transilvania, Cria̧na, Banat