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Sadoogh H, Saidi A. (2007). 'Spatial system as the essence of geographical studies', Geography, 4(11), pp. 1-20.
H Sadoogh and A Saidi, "Spatial system as the essence of geographical studies," Geography, 4 11 (2007): 1-20,
Sadoogh H, Saidi A. Spatial system as the essence of geographical studies. Geography. 2007;4(11):1-20 (In Persian).
