@article{SEDP_2002-2003____A16_0,
     author = {Sj\"ostrand, Johannes},
     title = {Pseudospectrum for differential operators},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:16},
     pages = {1--9},
     year = {2002-2003},
     publisher = {Centre de math\'ematiques Laurent Schwartz, \'Ecole polytechnique},
     zbl = {1061.35067},
     mrnumber = {2030711},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_2002-2003____A16_0/}
}