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Sharkov, George, Christina Todorova, Georgi Koykov, and Ivan Nikolov. "Towards a Robust and Scalable Cyber Range Federation for Sectoral Cyber/Hybrid Exercising: The Red Ranger and ECHO Collaborative Experience." \i Information & Security: An International Journal\i0  53, no. 2 (2022): 287-302.\par \par Sharkov, George, Christina Todorova, Georgi Koykov, and Georgi Zahariev. \i Hybrid Exercising for Cyber-Resilient Healthcare and  Cross-Sector Crisis Response Operability\i0  In \i Information Systems and Grid Technologies ISTG, CEUR Workshop Proceedings\i0 . Vol. 933., 2021.\par \par Sharkov, George, Christina Todorova, and Pavel Varbanov. "Strategies, Policies, and Standards in the EU Towards a Roadmap for Robust and Trustworthy AI Certification." \i Information & Security: An International Journal\i0  50, no. 1 (2021): 11-22.\par \par Sharkov, George, Christina Todorova, Georgi Koykov, and Georgi Zahariev. "A System-of-Systems Approach for the Creation of a Composite Cyber Range for Cyber/Hybrid Exercising." \i Information & Security: An International Journal\i0  50, no. 2 (2021): 129-148 .\par \par Sharkov, George, Yavor Papazov, Christina Todorova, Georgi Koykov, and Georgi Zahariev. "MonSys: A Scalable Platform for Monitoring Digital Services Availability, Threat Intelligence and Cyber Resilience Situational Awareness." \i Information & Security: An International Journal\i0  46, no. 2 (2020): 155-167.\par \par Sharkov, George, Yavor Papazov, Christina Todorova, Georgi Koykov, Martin Georgiev, and Georgi Zahariev. \i Cyber Threat Map for National and Sectoral Analysis\i0  In \i Computer and Communications Engineering, Workshop on Information Security 2019, 9th Balkan Conference in Informatics\i0 ., 2019.\par \par Papazov, Yavor, George Sharkov, Georgi Koykov, and Christina Todorova. "\i Managing Cyber Education Environments with Serverless Computing\i0 ." In \i DIGILIENCE 2019\i0 . Sofia, Bulgaria, 2019.\par \par Sharkov, George, and Christina Todorova. "Capture the Flag for Cyber-Resilience Exercising through Cryptographic Puzzles and Collaborative Problem-Solving." \i Information & Security: An International Journal\i0  37 (2017): 95-102.\par \par }