no. 3
On the genericity of nonvanishing instability intervals in periodic Dirac systems
Annales de l'I.H.P. Physique théorique, Tome 59 (1993) no. 3, pp. 315-326 
@article{AIHPA_1993__59_3_315_0,
     author = {Schmidt, Karl Michael},
     title = {On the genericity of nonvanishing instability intervals in periodic {Dirac} systems},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {315--326},
     year = {1993},
     publisher = {Gauthier-Villars},
     volume = {59},
     number = {3},
     mrnumber = {1276329},
     zbl = {0794.34076},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1993__59_3_315_0/}
}
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Schmidt, Karl Michael. On the genericity of nonvanishing instability intervals in periodic Dirac systems. Annales de l'I.H.P. Physique théorique, Tome 59 (1993) no. 3, pp. 315-326. https://www.numdam.org/item/AIHPA_1993__59_3_315_0/

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