Singular differences of powers of 2×2-matrices
Compositio Mathematica, Tome 104 (1996) no. 2, pp. 199-216. 
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     author = {Evertse, J.-H. and Tijdeman, R.},
     title = {Singular differences of powers of $2 \times 2$-matrices},
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Evertse, J.-H.; Tijdeman, R. Singular differences of powers of $2 \times 2$-matrices. Compositio Mathematica, Tome 104 (1996) no. 2, pp. 199-216. http://archive.numdam.org/item/CM_1996__104_2_199_0/

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