@unpublished{herzet:hal-01913339,
TITLE = {An instance optimality property for approximation problems with multiple approximation subspaces},
AUTHOR = {Herzet, Cedric and Diallo, Mamadou and H{\'e}as, Patrick},
URL = {https://inria.hal.science/hal-01913339},
NOTE = {working paper or preprint},
YEAR = {2018},
MONTH = Nov, PDF = {https://inria.hal.science/hal-01913339/file/MS_ROM_ACM.pdf},
HAL_ID = {hal-01913339},
HAL_VERSION = {v1},
}