@article{CM_1996__104_2_199_0,
     author = {Evertse, J.-H. and Tijdeman, R.},
     title = {Singular differences of powers of $2 \times 2$-matrices},
     journal = {Compositio Mathematica},
     pages = {199--216},
     publisher = {Kluwer Academic Publishers},
     volume = {104},
     number = {2},
     year = {1996},
     mrnumber = {1421400},
     zbl = {0869.11023},
     language = {en},
     url = {http://www.numdam.org/item/CM_1996__104_2_199_0/}
}