id	keyword
brj-22155	coal
brj-22155	et al
brj-22155	doi
brj-22155	humic
brj-22155	penicillium
brj-22155	degradation
brj-22155	biodegradation
brj-22155	products
brj-22155	coal products
brj-22155	coal degradation
brj-22155	low
brj-22155	acids
brj-22155	sodium
brj-22155	nitrate
brj-22155	soil