Error estimate in the generalized Szegö theorem
Journées équations aux dérivées partielles (1991), article no. 15, 7 p. 
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     author = {Ari Laptev and Yu Safarov},
     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},
     zbl = {0743.58032},
     mrnumber = {92j:35141},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1991____A15_0/}
}
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Ari Laptev; Yu Safarov. Error estimate in the generalized Szegö theorem. Journées équations aux dérivées partielles (1991), article  no. 15, 7 p. https://proceedings.centre-mersenne.org/item/JEDP_1991____A15_0/

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2. G. Szegö, Beiträge zur Theorie der Toeplizschen Formen, Math. Z. 6, 167-202 (1920). | JFM

3. V. Guillemin, Some Classical theorems in spectral theory revisited, Seminar on sing. of sol. of diff. eq., Princeton University. Press, Princeton, N.J., 219-259 (1979). | MR | Zbl

4. D. Robert, Remarks on a paper of S.Zelditch: «Szego limit theorems in quantum mechanics», J. Funct. Anal. 53, 304-308 (1983). | MR | Zbl