At: Braunkohle, Wärme und Energie, 1954, 15-16 By: Thomson P. W.
journalAt: Review of Palaeobotany and Palynology, 38, 3-4 By: Kerp H.
journalAt: Acta Botanica Neerlandica, 31, 5-6 By: Kerp H.
journalAt: Review of Palaeobotany and Palynology, 41, 1-2 By: Clement-Westerhof J. A.
journalAt: Review of Palaeobotany and Palynology, 62, 3-4 By: Kerp H., Poort R. J., Swinkels H. A. J. M., Verwer R.
journalAt: Acta Botanica Neerlandica, 35, 2 By: Visscher H., Kerp H., Clement-Westerhof J. A.
journalAt: Review of Palaeobotany and Palynology, 52, 4 By: Clement-Westerhof J. A.
journalAt: Review of Palaeobotany and Palynology, 54, 1-2 By: Kerp H., Haubold H.
journalAt: Review of Palaeobotany and Palynology, 63, 3-4 By: Poort R. J., Kerp H.
journalAt: Neues Jahrbuch für Geologie und Paläontologie Abhandlungen, 63, 1-3 By: Kerp H., Clement-Westerhof J. A.