no. 2
On the double-well problem for Dirac operators
Annales de l'I.H.P. Physique théorique, Tome 38 (1983) no. 2, pp. 153-166. 
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     pages = {153--166},
     publisher = {Gauthier-Villars},
     volume = {38},
     number = {2},
     year = {1983},
     mrnumber = {705337},
     zbl = {0529.35062},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1983__38_2_153_0/}
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Harrell, Evans M.; Klaus, M. On the double-well problem for Dirac operators. Annales de l'I.H.P. Physique théorique, Tome 38 (1983) no. 2, pp. 153-166. http://archive.numdam.org/item/AIHPA_1983__38_2_153_0/

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