found: Urban land management, regularization policies ... 1995(Irregular settlements)
found: Slums of hope? : Shanty towns of the Third World, 1979.
found: People and housing in Third World cities : perspectives on the problem of spontaneous settlements, 1975.
found: Abbott, J. An analysis of informal settlements ... 2001.
found: World Health Organization Website, Sept. 29, 2009(Informal settlements; these are defined as residential areas where a group of housing units have been constructed on land to which the occupants have no legal claim, or which they occupy illegally; unplanned settlements and areas where housing is not in compliance with current planning and building regulations.)