R.W.J.M. van der Ham, J.W.M. Jagt, & H.J. Janssens. (2011). Leymeriaster campestris, a new early Campanian hemiasterid echinoid from southern Limburg, the Netherlands. Netherlands Journal of Geosciences, 90, 179 - 185. https://doi.org/10.1017/S0016774600001098