E. Simon (2011) “The late Maastrichtian cancellothyridid brachiopod Terebratulina chrysalis (Von Schlotheim, 1813) from the type Maastrichtian (southern Limburg, the Netherlands) and elsewhere in Europe”, Netherlands Journal of Geosciences, 90, pp. 111 - 127. doi: 10.1017/S0016774600001062.