CHENG, J., S. PRÖßDORF and M. YAMAMOTO. "Local estimation for an integral equation of first kind with analytic kernel" Journal of Inverse and Ill-Posed Problems, 6.2 (2009): 115-126. Retrieved 21 May. 2013, from doi:10.1515/jiip.1998.6.2.115

CHENG, J., PRÖßDORF, S. & YAMAMOTO, M. (2009). Local estimation for an integral equation of first kind with analytic kernel. Journal of Inverse and Ill-Posed Problems, 6(2), pp. 95-171. Retrieved 21 May. 2013, from doi:10.1515/jiip.1998.6.2.115

CHENG, J., S. PRÖßDORF and M. YAMAMOTO. 2009. Local estimation for an integral equation of first kind with analytic kernel. Journal of Inverse and Ill-Posed Problems. 6(2): 95-171. Retrieved 21 May. 2013, from doi:10.1515/jiip.1998.6.2.115