id	keyword
fis-3669	doi
fis-3669	defect
fis-3669	sample
fis-3669	test
fis-3669	inspection
fis-3669	thermography
fis-3669	lst
fis-3669	testing
fis-3669	depth
fis-3669	heating
fis-3669	chulkov
fis-3669	time