Dr. S. Sanz Fernández de Córdoba (24 June 2004). "The 100 km Boundary for Astronautics". Fédération Aéronautique Internationale. Archived from the original on 20 June 2021. Retrieved 28 December 2020.
"Awards". FAI. 10 October 2017. Archived from the original on 17 May 2023. Retrieved 11 January 2018.
"FAI records". FAI. Archived from the original on 2 January 2021. Retrieved 28 December 2020.
Dr. S. Sanz Fernández de Córdoba (24 June 2004). "The 100 km Boundary for Astronautics". Fédération Aéronautique Internationale. Archived from the original on 20 June 2021. Retrieved 28 December 2020.
"Awards". FAI. 10 October 2017. Archived from the original on 17 May 2023. Retrieved 11 January 2018.
"FAI records". FAI. Archived from the original on 2 January 2021. Retrieved 28 December 2020.