KARCHEVSKY, A. L. "Properties of the misfit functional for a nonlinear one-dimensional coefficient hyperbolic inverse problem" Journal of Inverse and Ill-Posed Problems, 5.2 (2009): 139-164. Retrieved 25 May. 2013, from doi:10.1515/jiip.1997.5.2.139

KARCHEVSKY, A. (2009). Properties of the misfit functional for a nonlinear one-dimensional coefficient hyperbolic inverse problem. Journal of Inverse and Ill-Posed Problems, 5(2), pp. 101-204. Retrieved 25 May. 2013, from doi:10.1515/jiip.1997.5.2.139

KARCHEVSKY, A. L. 2009. Properties of the misfit functional for a nonlinear one-dimensional coefficient hyperbolic inverse problem. Journal of Inverse and Ill-Posed Problems. 5(2): 101-204. Retrieved 25 May. 2013, from doi:10.1515/jiip.1997.5.2.139