@article{etna_vol52_pp43-76, author = {Axel Klawonn and Martin K\"uhn and Oliver Rheinbach}, title = {Coarse spaces for FETI-DP and BDDC Methods for heterogeneous problems: connections of deflation and a generalized transformation-of-basis approach}, journal = {Electron. Trans. Numer. Anal.}, volume = {52}, year = {2020}, pages = {43--76}, doi = {10.1553/etna_vol52s43}, }