@article {27754,
	title = {Geochemistry of porphyrins, chlorins and polycyclic aromatics in soils, sediments and sedimentary rocks},
	volume = {32},
	year = {1968},
	pages = {737-772},
	publisher = {Geochimica et Cosmochimica Acta},
	author = {Hodgson, G. W. and Hitchon, B. and Taguchi, K. and Baker, B. l. and Peake, E.}
}
