Robert D. Falgout Jim E. Jones Ulrike Meier Yang Conceptual interfaces in <i>hypre</i>. 239-251 2006 22 Future Generation Comp. Syst. 1-2 http://dx.doi.org/10.1016/j.future.2003.09.006 db/journals/fgcs/fgcs22.html#FalgoutJY06