TY - JOUR T1 - Performance Enhancements and Parallel Algorithms for Two Multilevel Preconditioners JF - SIAM Journal on Scientific ComputingSIAM J. Sci. Comput. Y1 - 1993 A1 - Elman, Howard A1 - Guo,Xian-Zhong VL - 14 SN - 10648275 UR - http://link.aip.org/link/SJOCE3/v14/i4/p890/s1&Agg=doi CP - 4 M3 - 10.1137/0914055 ER -