The origin of alkaline fen in the Mosbeek Valley in the Netherlands is due to human impact rather than a natural development. Smeenge, H., Kooijman, A., Brinkkemper, O., Mars, H.d., Mauquoy, D. & van Geel, B. (2022) .  
Research paper; first published April 18, 2022.  
https://journals.sagepub.com/doi/10.1177/09596836221088230