What is an Intermediate city

here are some books talking about intermediate cities

1.  The definition of an intermediate city 
2.  "الترابط بين الريف والحضر" an arabic conference
3.  Thesis On intermediate cities developement (introduction)
4.  Thesis On intermediate cities (summary)
5. Thesis On intermediate cities (part one)
6. Thesis On intermediate cities (part two)
7. Thesis On intermediate cities (part three)

sources :

• BUE-Egypt (data room) 
• الترابط بين الريف والحضر (conference)
• AlSoudany,Moamen.,"Solar Energy Application In Urban Developement" ,  MSc, Mansoura University,Egypt