//-->
The Sudan transport study
Saaty, Thomas L., (1977)
Transport regiona v uslovijach perechoda k rynku
Dunaev, Oleg N., (1992)
Transport geography of India : (a study of Chambal Division, MP)
Gautam, Parashuram S., (1992)
The grazing resources of the Sudan
Khogali, Mustafa M., (1983)