Rolf Pelzing. 1994. “Source Parameters of the 1992 Roermond Earthquake, the Netherlands, and Some of Its Aftershocks Recorded at the Stations of the Geological Survey of Northrhine-Westphalia”. Netherlands Journal of Geosciences 73 (January):215-23. https://njgjournal.nl/index.php/njg/article/view/12463.