https://www.hankyung.com/finance/article/201905223358i

https://investor-dzsi.com/news/dasan-zhone-solutions-announces-closing-of-public-offering-of-common-stock-and-full-exercise-of-underwriters-option-to-purchase-additional-shares/

https://investor-dzsi.com/news/dasan-zhone-solutions-to-attend-the-20th-annual-b-riley-fbr-investor-conference-on-may-23rd-2019/

https://investor-dzsi.com/news/dasan-zhone-solutions-announces-pricing-of-public-offering-of-common-stock/

https://investor-dzsi.com/news/dasan-zhone-solutions-announces-launch-of-public-offering-of-common-stock/

http://it.chosun.com/site/data/html_dir/2019/05/15/2019051501803.html

http://www.itooza.com/common/iview.php?no=2019051514012016494

https://investor-dzsi.com/news/2019-q1/

http://view.asiae.co.kr/news/view.htm?idxno=2019050910085950518

http://www.edaily.co.kr/news/read?newsId=01079126622486624&mediaCodeNo=257&OutLnkChk=Y