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"A Riccati differential equation and free subgroup numbers for lifts of ..."
Christian Krattenthaler, Thomas W. Müller (2013)
- Christian Krattenthaler, Thomas W. Müller:
A Riccati differential equation and free subgroup numbers for lifts of PSL2(Z)PSL2(Z) modulo prime powers. J. Comb. Theory, Ser. A 120(8): 2039-2063 (2013)
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