1. Bradatan, C. 2011. “Scaling the Wall in the Head.” New York Times. Available at: https://opinionator.blogs.nytimes.com/2011/11/27/scaling-the-wall-in-the-head/
2. The Wall inside the brain: Overestimation of distances crossing the former Iron Curtain
3. Carrel, P. 2019. “Thirty Years after It Fell, the Berlin Wall Still Divides Germans.” Reuters, December 29. Available at: https://www.reuters.com/article/us-germany-berlinwall/thirty-years-after-it-fell-the-berlin-wall-still-divides-germans-idUSKBN1X31T6
4. Frontiers of Fear