id	domain	url
fumecheng-6196	doi.org	https://doi.org/10.22190/fume200306032p
fumecheng-6196	pdfs.semanticscholar.org	https://pdfs.semanticscholar.org/6bb3
fumecheng-6196	citeseerx.ist.psu.edu	http://citeseerx.ist.psu.edu
fumecheng-6196	www.rafako.com.pl	http://www.rafako.com.pl/products/boilers/668/pulverised-fuel-fired-boilers-with-steam-drum#type