[1]
R.T. Van Balen, J.M. Verweij, J.D. van Wees, H. Simmelink, F. Van Bergen, and H. Pagnier, “Deep subsurface temperatures in the Roer Valley Graben and the Peelblock, the Netherlands - new results”, njg, vol. 81, pp. 19-26, Mar. 2002.