van Wees , J.-D., M. van Putten, M. Pluymaekers, H. Mijnlieff, P. van Hooff, A. Obdam, and L. Kramers. “Geothermal Aquifer Performance Assessment for Direct Heat Production – Methodology and Application to Rotliegend Aquifers”. Netherlands Journal of Geosciences, vol. 91, Mar. 2014, pp. 651-65, doi:10.1017/S0016774600000433.