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Annick Mathey, Wim Van Roy, Luc Van Vaeck, Gert Eckhardt, Wolfgang Steglich (1994). "In situ analysis of a new perylene quinone in lichens by Fourier-transform laser microprobe mass spectrometry with external source". Rapid Communications in Mass Spectrometry. 8 (1): 46–52. Bibcode:1994RCMS....8...46M. doi:10.1002/rcm.1290080109.{{cite journal}}: CS1 maint: multiple names: authors list (link)