Fred G. Gustavson Jerzy Wasniewski Jack Dongarra Julien Langou Rectangular Full Packed Format for Cholesky's Algorithm: Factorization, Solution and Inversion http://arxiv.org/abs/0901.1696 2009 CoRR abs/0901.1696 db/journals/corr/corr0901.html#abs-0901-1696 informal publication