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4. Electronic Code of Federal Regulations: 14 CFR 460.
https://gov.ecfr.io/cgi-bin/text-idx?SID=bb4a10d55aee1159eda311744287c6f4&mc=true&node=pt14.4.460&rgn=div5
5. Shelton-Mur, K.: Commercial space transportation overview.
https://slideplayer.com/slide/7339577/