Équilibre instable en régime semi-classique. II. Conditions de Bohr-Sommerfeld
Annales de l'I.H.P. Physique théorique, Volume 61 (1994) no. 3, p. 347-367 
@article{AIHPA_1994__61_3_347_0,
     author = {Colin de Verdi\`ere, Yves and Parisse, Bernard},
     title = {\'Equilibre instable en r\'egime semi-classique. II. Conditions de Bohr-Sommerfeld},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     publisher = {Gauthier-Villars},
     volume = {61},
     number = {3},
     year = {1994},
     pages = {347-367},
     zbl = {0845.35076},
     mrnumber = {1311072},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1994__61_3_347_0}
}

Colin de Verdière, Yves; Parisse, Bernard. Équilibre instable en régime semi-classique. II. Conditions de Bohr-Sommerfeld. Annales de l'I.H.P. Physique théorique, Volume 61 (1994) no. 3, pp. 347-367. http://www.numdam.org/item/AIHPA_1994__61_3_347_0/

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