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2. Standard Test Method for Airport Pavement Condition Index Surveys;ASTM D 5340-11,2011
3. Standard Practice for Roads and Parking Lots Pavement Condition Index Surveys;ASTM D 6433-11,2011
4. Vivere a Roma;Cecconi,2007
5. How to make traffic calming more walking friendly: directions to increase intersections performances for pedestrians;Corazza,2003