H.Soussi, H. , M.Hussain, M. , H.Afifi, H. , D.Seret, D. (2007), 'IKEv1 and IKEv2: A Quantitative Analyses', World Academy of Science, Engineering and Technology, Open Science Index 6, International Journal of Computer and Information Engineering, 1(6), 1805 - 1808.