J.W.M. Jagt, R.H.B. Fraaije and B.W.M. van Bakel 2009. A late Miocene astropectinid (Echinodermata, Asteroidea) and associated ichnofossils from Liessel, province of Noord-Brabant, the Netherlands. Netherlands Journal of Geosciences. 88, (Sep. 2009), 127 - 131. DOI:https://doi.org/10.1017/S0016774600000937.