Boris N. Khoromskij, Siegfried Prössdorf. Multilevel preconditioning on the refined interface and optimal boundary solvers for the Laplace equation. Adv. Comput. Math., 4(1):331-355, 1995. [doi]
@article{KhoromskijP95,
title = {Multilevel preconditioning on the refined interface and optimal boundary solvers for the Laplace equation},
author = {Boris N. Khoromskij and Siegfried Prössdorf},
year = {1995},
doi = {10.1007/BF02123480},
url = {http://dx.doi.org/10.1007/BF02123480},
researchr = {https://researchr.org/publication/KhoromskijP95},
cites = {0},
citedby = {0},
journal = {Adv. Comput. Math.},
volume = {4},
number = {1},
pages = {331-355},
}