1. Stuart Croft, “Introduction”, Government and Opposition 42, no. 3 (2007): 269 (with reference to Jörg Monar).
2. Victor Asal and R. Karl Rethemeyer, “The Nature of the Beast: Organizational Structures and the Lethality of Terrorist Attacks”, The Journal of Politics 70 (2008): 447 (cited in Sanchez-Cuenca and de la Calle, “Domestic Terrorism”, 32).
3. Gilles Kepel, Beyond Terror and Martyrdom: The Future of the Middle East (Cambridge: Belknap Press of Harvard University Press, 2008), 124–125.
4. Arnold Wolfers, “National Security as Ambiguous Symbol,” Political Science Quarterly LXVII, no. 4 (1952): 484.
5. One study reported 85% of European elites saw immigration as a rising problem, with an increase in xenophobic and nationalist groups (Gallya Lahav, Immigration and Politics in the New Europe, Reinventing Borders (Cambridge: Cambridge University Press, 2004), 143, 179, 189).