Sources : 
* https://www.nknews.org/pro/ready-for-liftoff-satellite-imagery-shows-progress-of-dprks-space-program/
* https://www.nknews.org/pro/upgrades-activity-ongoing-at-north-koreas-satellite-control-center-imagery/
* https://www.nknews.org/pro/revealed-north-koreas-new-space-environment-test-center/
* https://www.youtube.com/watch?v=0jKm-5qJIME (CNN, 23 september 2015, N. Korea gives CNN rare look at satellite center)