Hussler, G.; Connan, J.; Albrecht, P. (1984): Novel families of tetra- and hexacyclic aromatic hopanoids predominant in carbonate rocks and crude oils. Pergamon, Oxford-New York, International, In: Schenck, P. A. (editor), de Leeuw, J. W. (editor), Lijmbach, G. W. M. (editor), Advances in organic geochemistry 1983, 6, 39-49, georefid:1986-001818