+@article{Frommer92,
+year={1992},
+journal={Numerische Mathematik},
+volume={63},
+number={1},
+title={H-Splittings and two-stage iterative methods},
+publisher={Springer-Verlag},
+author={Frommer, Andreas and Szyld, DanielB.},
+pages={345--356}
+}
+
+@article{Alefeld97,
+year={1997},
+journal={Numerische Mathematik},
+volume={75},
+title={On multisplitting methods for band matrices},
+publisher={Springer-Verlag},
+author={Alefeld, Götz and Lenhardt, Ingrid and Mayer, Günter},
+pages={267--292}
+}
+
+