@incollection{MSMF_1989_2_38__5_0,
     author = {Auslander, Maurice and Buchweitz, Ragnar-Olaf},
     title = {The homological theory of maximal {Cohen-Macaulay} approximations},
     booktitle = {Colloque en l'honneur de Pierre Samuel (Orsay 21-22 mai 1987)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {5--37},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {38},
     year = {1989},
     doi = {10.24033/msmf.339},
     mrnumber = {91h:13010},
     zbl = {0697.13005},
     url = {http://archive.numdam.org/articles/10.24033/msmf.339/}
}