I have a problem with one of my references in the below code, it complains about the third one with:

Package inputenc Error: Keyboard character used is undefined

and here is the code:





    \usepackage{hhline}% http://ctan.org/pkg/hhline




\bibitem{jour} Othmane, Lotfi ben, Ranchal, Rohit, Fernando, Ruchith, Bhargava, Bharat,  Bod-den, Eric. (2015). Incorporating attacker capabilities in risk estimation and mitigation. Comput. Secur., 51(C), 41-61. doi: 10.1016/j.cose.2015.03.001

\bibitem{book} Alberts C, Dorofee A. Managing Information Security Risks: The OCTAVE Approach, Addison-Wesley Professional.2002.

\bibitem{jour} Schneier, B.: Attack Trees. Dr. Dobb’s Journal (1999).

\bibitem{proceeding1} Czajkowski, K., Fitzgerald, S., Foster, I., Kesselman, C.: Grid
Information Services for Distributed Resource Sharing. In: 10th IEEE
International Symposium on High Performance Distributed Computing, pp.
181--184. IEEE Press, New York (2001)

\bibitem{proceeding2} Foster, I., Kesselman, C., Nick, J., Tuecke, S.: The Physiology of the
Grid: an Open Grid Services Architecture for Distributed Systems
Integration. Technical report, Global Grid Forum (2002)

\bibitem{url} National Center for Biotechnology Information, \url{http://www.ncbi.nlm.nih.gov}




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