@article{AIHPA_1983__38_2_153_0,
     author = {Harrell, Evans M. and Klaus, M.},
     title = {On the double-well problem for {Dirac} operators},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {153--166},
     publisher = {Gauthier-Villars},
     volume = {38},
     number = {2},
     year = {1983},
     mrnumber = {705337},
     zbl = {0529.35062},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1983__38_2_153_0/}
}