Wichmann Matthiessen, Christian, Annette Winkel Schwarz, and Søren Find. “Research Centers of the World: Strength, Networks and Nodality. An Analysisbased on Bibliometric Indicators”. Geografisk Tidsskrift - Danish Journal of Geography 100 (January 1, 2000). Accessed September 27, 2024. https://tidsskrift.dk/geografisktidsskrift/article/view/42377.