10© L.MORA ET AL 2750 2500 2584authors involved in the F production of source documents 2250 %towork bewteen 1992 and 2009 percentage of authors who started 2000 88.89%68 petween2609and202 percentage of authors who started 1750 1500 1250 1000 750 LI07 1sn3nV St 9:E0e [ASJaAlun SuoloeIf leyueys]Kq papeojumod 500 250 0-一 Figure 4.Cumulative growth in the number of authors involved in the production of source documents hand with the lack of cohesion between the researchers involved in their production.As a result,the intellectual structure of the smart-city research area is divided into a multitude of unconnected publications.The central core of the network,indeed,is compact and well- 40 ●NODE TY1- ●oont3 oa Figure 5.Knowledge structure of the smart-city research fieldhand with the lack of cohesion between the researchers involved in their production. As a result, the intellectual structure of the smart-city research area is divided into a multitude of unconnected publications. The central core of the network, indeed, is compact and well￾Figure 4. Cumulative growth in the number of authors involved in the production of source documents Figure 5. Knowledge structure of the smart-city research field 10 L. MORA ET AL. Downloaded by [Shanghai Jiaotong University] at 03:36 25 August 2017