Ishiwatari, Ryoshi; Morinaga, Shigeo; Simoneit, Bernd R. T. (1985): Alkaline permanganate oxidation of kerogens from Cretaceous black shales thermally altered by diabase intrusions and laboratory simulations. Pergamon, Oxford, International, Geochimica et Cosmochimica Acta, 49 (8), 1825-1835, georefid:1986-015731