https://www.spglobal.com/spdji/en/indices/equity/sp-aerospace-defense-select-industry-index/#overview + https://www.msci.com/documents/10199/3675869d-f312-4d1f-8ca8-aa59b8220330 + https://stoxx.com/index/sweutdp/ + https://markets.ft.com/data/indices/tearsheet/summary?s=FTASX502010:FSI + https://www.niftyindices.com/indices/equity/thematic-indices/nifty-india-defence
https://www.nature.com/articles/s41599-024-04231-7
https://www.goldmansachs.com/insights/articles/the-future-of-european-defense