Frederiksen, P. (1985) “P. Koorevaar, G. Menelik and C. Dirksen: Elements of soil physics. (Developments in soil science, 13)”., Geografisk Tidsskrift, 85. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44164 (Set: 5 december 2025).