id	keyword
ajeer-6553	urbanization
ajeer-6553	new
ajeer-6553	total
ajeer-6553	factor
ajeer-6553	productivity
ajeer-6553	effect
ajeer-6553	cities
ajeer-6553	level
ajeer-6553	indicator
ajeer-6553	development
ajeer-6553	factor productivity
ajeer-6553	journal
ajeer-6553	matrix
ajeer-6553	model
ajeer-6553	china
ajeer-6553	asian