Tomassen HBM, Smolders AJP, Lamers LPM, Roelofs JGM. Stimulated growth of Betula pubescens and Molinia caerulea on ombrotrophic bogs: role of high levels of atmospheric nitrogen deposition. Journal of Ecology. 2003  ;91:357-370.

Arts GHP, Van der Velde G, Roelofs JGM, Van Swaay CAM. Successional changes in the soft-water macrophyte vegetation of (sub)atlantic, sandy, lowland regions during this century. Freshwater Biology. 1990  ;24:287-294.