1. A. Barrlund, Constrained least squares methods for non-linear differential algebraic systems,Report UMINF-91.15, University of Umea, Institute of Information Processing, Umea, Sweden, 1991.
2. J. Baumgarte, Stabilization of constraints and integrals of motion in dynamical systems,Comp. Math. Appl. Mech. Engr., vol. 1, pp. 1?16, 1972.
3. P. T. Boggs, The convergence of the Ben-Israel iteration for nonlinear least squares problems,Math. Comp., vol. 30, pp. 512?522, 1976.
4. K. E. Brenan, S. L. Campbell, and L. R. Petzold,Numerical Solution of Initial-Value Problems in Differential-Algebraic Equations, Elsevier (North-Holland), 1989.
5. K. E. Brenan, FORTRAN Program, private communication.