The dvi files do not contain figures. A few of the references do not have ready dvi and psfiles. Here is a list in Bibtex format. Journal Publications Xue-Cheng Tai Finite element methods used in one and two dimensional distributed parameter identification problems of parabolic type. Xue-Cheng Tai and Pekka Neittaanmaki.
Error estimates for numerical identification of distributed parameters.
X.-C. Tai and T. Karkainen Identification of a nonlinear parameter in a parabolic equation from a linear equation. K. Kunisch and X.-C. Tai Sequential and parallel splitting methods for bilinear control problems in Hilbert spaces. SIAM J. Numer. Proceedings and preprints Xue-Cheng Tai and Pekka Neittaanmaki. A linear approach for the nonlinear distributed parameter identification.