no. 2
Semiclassical analysis of low lying eigenvalues. I. Non degenerate minima : asymptotic expansions
Annales de l'I.H.P. Physique théorique, Tome 40 (1984) no. 2, p. 224. 
@article{AIHPA_1984__40_2_224_0,
     author = {Simon, Barry},
     title = {Semiclassical analysis of low lying eigenvalues. {I.} {Non} degenerate minima : asymptotic expansions},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {224--224},
     publisher = {Gauthier-Villars},
     volume = {40},
     number = {2},
     year = {1984},
     zbl = {0537.35023},
     mrnumber = {747203},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1984__40_2_224_0/}
}
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Simon, B. Semiclassical analysis of low lying eigenvalues. I. Non degenerate minima : asymptotic expansions. Annales de l'I.H.P. Physique théorique, Tome 40 (1984) no. 2, p. 224. http://www.numdam.org/item/AIHPA_1984__40_2_224_0/