no. 4
Some remarks on double-wells in one and three dimensions
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 4, pp. 405-417 
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     author = {Klaus, M.},
     title = {Some remarks on double-wells in one and three dimensions},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {405--417},
     year = {1981},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {4},
     mrnumber = {625171},
     zbl = {0474.35041},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1981__34_4_405_0/}
}
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Klaus, M. Some remarks on double-wells in one and three dimensions. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 4, pp. 405-417. https://www.numdam.org/item/AIHPA_1981__34_4_405_0/

[1] M. Klaus and B. Simon, Ann. Inst. H. Poincaré, t. XXX, no. 2, 1979, p. 83-87. | Numdam

[2] E.M. Harrell, Comm. Math. Phys., t. 75, 1980, p. 239. | Zbl | MR

[3] J. Morgan and B. Simon, Int. J. Quantum Chem., t. 17, 1980, p. 1143.

[4] M. Reed and B. Simon, Methods of Modern Mathematical Physics, IV. Analysis of Operators, Academic Press, 1978. | Zbl | MR

[5] M. Klaus and B. Simon, Coupling Constant Thresholds in Non relativistic Quantum Mechanics, I. Short Range Two Body Case, to appear in Ann. of Physics. | Zbl | MR

[6] H.R. Gruemm, Rep. Math. Phys., t. 4, 1973, p. 211. | Zbl