1. Campbell, S. L., Linear time varying singular systems of differential equations, Dept. Mathematics, North Carolina State Univ., Raleigh, 1981.
2. Deuflhard, P., Order and stepsize control in extrapolation methods, Preprint No. 93, Univ. Heidelberg, 1980.
3. Gear, C. W., The simultaneous numerical solution of differential-algebraic equations, IEEE Trans. Circuit Theory TC-18, (1), 1971, 89–95.
4. Gear, C. W., Hsu, H. H. and L. Petzold, Differential-algebraic equations revisited, Proc. Numerical Methods for Solving Stiff Initial Value Problems, Oberwolfach, W. Germany, June 28-July 4, 1981.
5. Gear, C. W. and L. R. Petzold, Differential/algebraic systems and matrix pencils, Proc. Conference on Matrix Pencils, Pitea, Sweden, March 1982; also, Dept. Rpt. UIUCDCSR-82–1086, 1982.