Exudation of low molecular weight organic acids by Lupinus albus L., Lupinus angustifolius L. and Lupinus luteus L. as affected by phosphorus supply Komi Egle, Wilhelm Römer and Holger KellerAgronomie, 23 5-6 (2003) 511-518DOI: https://doi.org/10.1051/agro:2003025