Marinov, Stefan, Aleksander Kolev, and Ivan Ivanov. Modeling a Managed Communication Environment In Jubilee Scientific Conference with International Participation ?Modern Aviation Training Trends?. D. Mitropolia, 2017.

Marinov, Stefan, Aleksander Kolev, and Ivan Ivanov. Modeling of a managed communication environment In Jubilee scientific conference with international participation "Contemporary trends in aviation training". D. Mitropolia, 2017.

Marinov, Stefan, Aleksander Kolev, and Ivan Ivanov. Modelling a Managed Communication Environment In Anniversary Scientific Conference ?Modern Aviation Training Trends. Dolna Mitropolia, Bulgaria, 2017.

Pavlov, Georgi, and Aleksander Kolev. A Place for GIS Technologies in Information Systems for Crisis Prevention In 6th International Conference on Application of Information and Communication Technology and Statistics in Economy and Education (ICAICTSEE 2016). Sofia, 2016.

G., Pavlov, and Aleksander Kolev. A place of GIS technologies in information systems for crisis prevention In 6TH International Conference on Application of Information and Communication Technology and Statistics in Economy and Education (ICAICTSEE 2016). Sofia, 2016.