1. Low intensity spectral analysis of liptinite, vitrinite and inertinite macerals;Crelling,1991
2. An introduction of the photochemistry of coals;Darwent,1987
3. Observations concerning the nature of maceral alteration with time;Davis;Org. Geochem.,1990
4. Laser induced macrofluorescence of coal: oxidation and spectral effects;Death;Fuel,1991
5. Fluoreszenzintensität und Reflexionsvermögen von Vitriniten und Inertiniten zur Kennzeichnung des Verkokungsverhaltens;Diessel;Glückauf-Forschungsh.,1986