Invisible battlegrounds in the 21st century : psychological warfare, influence operations and their impact on NATO's future from the Baltic perspectiveMölder, HolgerTowards #NATO2030: The regional perspective of the Baltic States and Poland2020 / p. 111-122 https://liia.lv/en/publications/towards-nato2030-the-regional-perspective-of-the-baltic-states-and-poland-896