SÝKORA, Juraj. Eastern Flank of NATO - Analysis of the Eastern Flank on NATO Countries' Military Expenditure. In EDAMBA 2023. International Scientific Conference for Doctoral Students and Post-Doctoral Scholars. EDAMBA 2023 : International Scientific Conference for Doctoral Students and Post-Doctoral Scholars. - Bratislava : Vydavateľstvo EKONÓM, 2024. ISBN 978-80-225-5127-4, s. 272-281.