Greve, Bent and Maj Rydbjerg. Research Paper no. 11/03: Cross-Border Commuting in the EU: Obstacles and Barriers. Country Report: The Øresund Region. Roskilde University, 2003, ISSN1399-1396. Available in pdf format from Roskilde University. Retrieved 22 November 2007.
Greve, Bent and Maj Rydbjerg. Research Paper no. 11/03: Cross-Border Commuting in the EU: Obstacles and Barriers. Country Report: The Øresund Region. Roskilde University, 2003, ISSN1399-1396. Available in pdf format from Roskilde University. Retrieved 22 November 2007.