Pestov, Leonid. "Inverse problem of determining absorption coefficient in the wave equation by BC method" Journal of Inverse and Ill-Posed Problems, 20.1 (2012): 103-110. Retrieved 26 May. 2013, from doi:10.1515/jip-2011-0015

Pestov, L. (2012). Inverse problem of determining absorption coefficient in the wave equation by BC method. Journal of Inverse and Ill-Posed Problems, 20(1), pp. 1-138. Retrieved 26 May. 2013, from doi:10.1515/jip-2011-0015

Pestov, Leonid. 2012. Inverse problem of determining absorption coefficient in the wave equation by BC method. Journal of Inverse and Ill-Posed Problems. 20(1): 1-138. Retrieved 26 May. 2013, from doi:10.1515/jip-2011-0015