Balstrøm, T. (1992) “Remote sensing and geographical information systems for resource management in developing countries. Eds. Alan S. Belward & Carlos R. Valenzuela. (Euro courses: Remote sensing, vol. 1”., Geografisk Tidsskrift, 92. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44870 (Set: 5 december 2025).