The Structure of General Relativity with a Numerical Illustration: The Collision of Two Black Holes
L. Smarr Ph.D. Dissertation, University of Texas at Austin (1975). Ph.D. Advisor Bryce S. DeWitt (Deceased).
Maximally Slicing a Black Hole
F. Estabrook, H. Wahlquist, S. Christensen, B. DeWitt, L. Smarr and E. Tsiang, Physical Review D7, 2814-2817, (1973).