Markuszewska, Iwona, et al. “Boundaries From Borders: Cross-Border Relationships in the Context of the Mental Perception of a Borderline – Experiences from Spanish-French and Polish-German Border Twin Towns”. Quaestiones Geographicae, vol. 35, no. 1, Mar. 2016, pp. 105-19, doi:10.1515/quageo-2016-0010.