[Gadzalov, N. & Krastev, K. (2013). Characteristics of the asymmetric threats in the modern conflicts, NMU Annual Scientific Conference’2013, Veliko Tarnovo: NMU Publisher.]Search in Google Scholar
[Kaykov, D. (1998). Monostructural methods of psychic balancing and mental recovery, Sofia: Propeler 92 Publisher.]Search in Google Scholar
[Krastev, K. (2013). Improvement of the contingency training for joint tactical operation in MOOTW, Veliko Tarnovo: NMU Publisher.]Search in Google Scholar
[Madanski, V. (2013a). Education as a basis for the development of modern safety culture, International virtual journal for science, techniques and innovations for the industry, Issue 9.]Search in Google Scholar
[Madanski, V. (2013b). Survival in extreme military professional environment, Monography, Veliko Tarnovo: NMU Publisher.]Search in Google Scholar
[Nikolov, R. (2015). Prospects for Development of the Armed Forces of the Republic of Bulgaria in the Hybrid Threats Environment, available at: http://www.mod.bg/bg/doc/ministry/nachalnikotbrana/20150901_lekcia_va.pdf]Search in Google Scholar