https://africa.chinadaily.com.cn/world/2013-11/02/content_17076128.htm
World View to offer balloon spaceflight experience[1]|chinadaily.com.cn
World View plans to use a helium balloon to lift customers to the edge of the Earth's atmosphere to take in an unprecedented view of the planet. The...
world viewto offerspaceflight experienceballoon
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20080018689.pdf
NASA Experience with Pogo in Human Spaceflight Vehicles - NASA Technical Reports Server (NTRS)
An overview of more than 45 years of NASA human spaceflight experience is presented with respect to the thrust axis vibration response of liquid fueled rockets...
in human