Potentials wells in high dimensions II, more about the one well case
Annales de l'I.H.P. Physique théorique, Tome 58 (1993) no. 1, pp. 43-53. 
@article{AIHPA_1993__58_1_43_0,
     author = {Sj\"ostrand, Johannes},
     title = {Potentials wells in high dimensions {II,} more about the one well case},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {43--53},
     publisher = {Gauthier-Villars},
     volume = {58},
     number = {1},
     year = {1993},
     mrnumber = {1208791},
     zbl = {0770.35051},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1993__58_1_43_0/}
}
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Sjöstrand, Johannes. Potentials wells in high dimensions II, more about the one well case. Annales de l'I.H.P. Physique théorique, Tome 58 (1993) no. 1, pp. 43-53. http://archive.numdam.org/item/AIHPA_1993__58_1_43_0/

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[S] J. Sjöstrand, Potential Wells in High Dimensions, I, Ann. Inst. H. Poincaré, Phys. Théor., Vol. 58, 1993, pp. 1-41. | Numdam | MR | Zbl