@Article{ Griebel:1994*2, author = { M.~Griebel}, title = {Multilevel algorithms considered as iterative methods on semidefinite systems}, journal = { {SIAM Int. J. Sci. Stat. Comput.}}, volume = {15(3)}, pages = {547--565}, year = {1994}, annote = {article}, ps = {http://wissrech.ins.uni-bonn.de/research/pub/griebel/sjjssc_neu.ps.gz} }