One of the new areas of investigation that I am involved in is development of efficient and stable methods for the solution of bordered linear systems. This is a cooperation with Plamen Yalamov form University of Rousse, Bulgaria. The results have been summarized in:

+ "Stability and Performance Analysis of a Block Elimination Solver for Bordered Linear Systems," with P. Yalamov, IMA Journal of Numerical Analysis, Vol. 19, 1999, 335-348

+ "A New Stable Block Elimination Based Solver for Bordered Linear Systems," with P. Yalamov, in: M. Griebel et. al. (eds.) Large-Scale Scientific Computations of Engineering and Environmental Problems, VIEWEG, Wisbaden, 1998, 310-318