Niemeyer, Klaus. 2021. “European Conflict Analysis Project (ECAP)”. Information & Security: An International Journal. https://doi.org/10.11610/isij.4902.
Strategic thinking
Tagarev, Todor, and Valeri Ratchev. 2008. “Part 2: Force Structure 2018”. In Bulgaria’s Defence Policy and Force Development 2018. Sofia: Military Publishing House.