GRADUAL GASIFYING OF LOW RANK COAL
high sulphur occurring low rank coal
low rank bituminous coals
low-rank coal reservoir
low-rank coal-bed methane
high rank bituminous coal
2-D convolution with big kernel in low-rank
high-low-low temperature
high-low-low temperature process
LLWL (low-low water level)
low grade bituminous coal
low rank adaptive filter