1. Spinal injuries in airborne accidents: a demographic overview of 148 patients in a level-1 trauma center;Bäcker;Eur. Spine J.,2019
2. Epidemiology and injury patterns of aerial sports in Switzerland;Bäcker;World J. Orthoped.,2020
3. Code of Federal Regulations, Title 14 (Federal Aviation Regulations), Part 103. https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-103.
4. Spinal and pelvic injuries in airborne sports: a retrospective analysis from a major Swiss trauma centre;Hasler;Injury,2012
5. https://www.govinfo.gov/content/pkg/CFR-2011-title14-vol2/pdf/CFR-2011-title14-vol2-sec91-17.pdf.