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Janssen, A. W.; Jagt, J. W. M. (1987). Late Oligocene fossiliferous concretions of local origin from Quaternary Rhine-deposits at Kamp-Lintfort, Lower Rhine District, F.R.G, with a description of Schizaster (Schizaster) sp. (Echinodermata, Spatangoida). Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie. 24(4): 247-260.
Janssen, A. W.; Jagt, J. W. M. (1987). Late Oligocene fossiliferous concretions of local origin from Quaternary Rhine-deposits at Kamp-Lintfort, Lower Rhine District, F.R.G, with a description of Schizaster (Schizaster) sp. (Echinodermata, Spatangoida). Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie. 24(4): 247-260.
