@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},
     publisher = {Gauthier-Villars},
     volume = {59},
     number = {3},
     year = {1993},
     mrnumber = {1276329},
     zbl = {0794.34076},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1993__59_3_315_0/}
}