@article{PMIHES_2001__94__87_0,
     author = {Ben-Zvi, David and Frenkel, Edward},
     title = {Spectral curves, opers and integrable systems},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {87--159},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {94},
     year = {2001},
     mrnumber = {1896178},
     zbl = {1113.14301},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_2001__94__87_0/}
}