id	keyword
fens-721	production
fens-721	bioethanol
fens-721	food
fens-721	biomass
fens-721	bioethanol production
fens-721	biofuels
fens-721	microalgae
fens-721	environment
fens-721	generation
fens-721	volume
fens-721	feedstocks
fens-721	energy
fens-721	residues
fens-721	issue
fens-721	xix
fens-721	safety
fens-721	review
fens-721	content
fens-721	journal
fens-721	engineering
fens-721	cellulose