[1]
Torild van Eck and Colin Davenport, “Seismotectonics and seismic hazard in the Roer Valley Graben; with emphasis on the Roermond earthquake of April 13, 1992: Workshop, January 20-22, 1993, Veldhoven, the Netherlands”, njg, vol. 73, pp. 91-92, Jan. 1994.