TY  - BOOK
AU  - Parkes, Roderick  
ED  - Institute for Security Studies
TI  - 20 years on: : rethinking Schengen
PY  - 2015///
PB  - EU Insitute for Security Studies
KW  - Acuerdo de Schengen
KW  - Control de fronteras
UR  - http://www.iss.europa.eu/uploads/media/Brief_39_Schengen.pdf
ER  -