Fig. 2
From: Quality of service and fairness for electric vehicle charging as a service
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs42162-021-00175-3/MediaObjects/42162_2021_175_Fig2_HTML.png)
Hierarchical composition of EVs and SUs for the queuing approach
From: Quality of service and fairness for electric vehicle charging as a service
Hierarchical composition of EVs and SUs for the queuing approach