@incollection{JEDP_1991____A15_0,
     author = {Laptev, Ari and Safarov, Yu},
     title = {Error estimate in the generalized {Szeg\"o} theorem},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {15},
     pages = {1--7},
     publisher = {\'Ecole polytechnique},
     year = {1991},
     mrnumber = {92j:35141},
     zbl = {0743.58032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JEDP_1991____A15_0/}
}