Kyselka D, Efmertová M. Czechoslovak and Polish intelligence (cryptologic) services at the time of the institutionalisation of both states and their armies after 1918. Acta Polytech [Internet]. 2024 Jul. 9 [cited 2026 May 20];64(3):246-59. Available from: https://ojs.cvut.cz/ojs/index.php/ap/article/view/9670