The Future of Schengen – European Council on Foreign Relations
The Schengen Agreement - History and the Definition
Visa Waiver Eligible Travelers Going To Europe & Schengen Countries Will Require ETIAS Electronic Travel Authorization From 2021 - LoyaltyLobby
Entry Exit System EES system (EU borders in 2022)
The Schengen crisis: a failure - The New Federalist
Border fences and internal border controls in Europe (March 2017) - World | ReliefWeb
6 Schengen Area Countries Have Now Extended Their Border Controls for Another Half-Year - SchengenVisaInfo.com
EU internal borders may be reimposed for two years
Schengen: a guide to the European border-free zone | News | European Parliament
Entry/Exit System (EES) - Schengen Area Border Control
EU facts behind the claims: borders - Full Fact
Free movement and border policies in Africa and Europe
The slow death of Schengen – EURACTIV.com
Is this the end of Schengen? | World Economic Forum
Schengen Border Controls in the Time of Coronavirus (April 14, 2020) - Political Geography Now
What is Schengen? - Australian Institute of International Affairs - Australian Institute of International Affairs
Why the Schengen agreement might be under threat | The Economist
Border checks in EU challenge Schengen Agreement – DW – 11/12/2019
Schengen Area - Wikipedia
Strengthening the EU's external borders - Consilium
