Florian Hecht, Yeon Jin Lee, Jonathan R. Shewchuk, and James F. O'Brien.
"<strong>Updated Sparse Cholesky Factors for Corotational
  Elastodynamics</strong>".
<em>ACM Transactions on Graphics</em>, 31(5):123:1&ndash;13, October 2012.
Presented at SIGGRAPH 2012.