Investigations of the raw material in hard-coal-mining - Microscopical examinations of hard coal, coke and briquettes - Part 5: Reflectance measurements on vitrinites— 21 стр.
Investigations of the raw material in hard-coal-mining microscopical examinations of hard coal, coke and briquettes; reflectance measurements on vitrinites— 11 стр.
Optical radiation physics and illumination Engineering - Supplement 1: Index of quantities, symbols and units; and subject index to DIN 5031 part 1 to part 11— 24 стр.
