Head-on Collisions of Two Black Holes

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Geometry of a Black Hole Collision – Science Magazine

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Dynamics of Apparent and Event Horizons

P. Anninos, D. Bernstein, S. Brandt, J. Libson, Joan Masso, E. Seidel, L. Smarr, W.-M. Suen, and P. Walker. Physical Review Letters, 74, 630. (1995).

Oscillating Apparent Horizons In Numerically Generated Spacetimes

Peter Anninos, David Bernstein, Steve Brandt, David Hobill, Ed Seidel, Larry Smarr, Australian Journal of Physics, 48, 1027-43 (1995).

Dynamics of Black Hole Apparent Horizons

Peter Anninos, David Bernstein, Steven R. Brandt, David Hobill, Edward Seidel, and Larry Smarr,Physical Review D15, 50, 3801. (1994).