1



2



4
Erschienen: Berlin, SWP, [Mai 2019]
SWP-aktuell - Nr. 30 (Mai 2019)



5
Erschienen: Berlin, SWP, [May 2019]
SWP comment - no. 25 (May 2019)



6
Erschienen: [Washington, DC], Congressional Research Service, February 21, 2019
Updated February 21, 2019, version 20
7



8
Erschienen: London, Routledge, 2019
1st.