title: Mass spectrometry of polycyclic tetracarboxylic ('ARN') acids and tetramethyl esters.
authors.affiliation: Petroleum and Environmental Geochemistry Group, Biogeochemistry Research Centre, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Sutton
authors.forename: Benjamin E
authors.initials: BE
authors.lastname: Smith
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Rowland