id	domain	url
issue-741	doi.org	https://doi.org/10.30525/2256-0742/2019-5-5-84-89
issue-741	www.visualcapitalist.com	https://www.visualcapitalist.com/map-countriesby-tourist-spending
issue-741	www.dy.nayka.com.ua	http://www.dy.nayka.com.ua/?op=1&z=889
issue-741	www.theglobaleducationproject.org	https://www.theglobaleducationproject.org/earth/fisheries-and-aquaculture.php
issue-741	www.statista.com	https://www.statista.com/statistics/233223/travel-andtourism--total-economic-contribution-worldwide
issue-741	www.ncbi.nlm.nih.gov	https://www.ncbi.nlm.nih.gov/pmc/articles/pmc5739484
issue-741	citystrategy.leontief.ru	http://citystrategy.leontief.ru./world/marinig.htm
issue-741	dx.doi.org	http://dx.doi.org/10.21511/ppm.16(4).2018.04