Upper bounds for class numbers of real quadratic fields

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1. Maohua Le, A correction to the paper "Upper bounds for class numbers of real quadratic fields" (Acta Arith. 68 (1994), 141-144)
2. Yuan-e Zhao, Tingting Wang, A note on the number of solutions of the generalized Ramanujan-Nagell equation $x^2-D=p^n$
3. Yann Bugeaud, On the diophantine equation $x^2-p^m=\pm y^n$
4. Stéphane Louboutin, On the use of explicit bounds on residues of Dedekind zeta functions taking into account the behavior of small primes