1. 7 July 2005 London Bombings. Wikipedia, 2005.
2. 2010 Moscow Metro Bombings. Wikipedia, 2010.
3. 2016 Brussels Bombings. Wikipedia, 2016.
4. Zhao Y. T., Lin J. W., Shi L. Research status of terrorist explosion in subway. The Proceedings of the Second National Conference on Engineering Safety and Protection, Vol. 1, 2010, p. 210-213.
5. Parsons, Brinckerhoff, Quade, et al.Making Transportation Tunnels Safe and Secure. Transportation Research Board, Report 525, Vol. 12, 2006, p. 232-245.