APIS Bibliography

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Houdijk ALFM, Verbank PJM, van Dijk HFG, Roelofs JGM. Distribution and decline of endangered herbaceous heathland species in relation to the chemical composition of the soil. Plant and Soil. 1993 ;148:137-143.

De Graaf MCC, Bobbink R, Roelofs JGM, Verbank PJM. Differential effects of ammonium nitrate on three heathland species. Plant Ecology. 1998 ;135:185-196.