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[<span class='BibKeyLink'><a href="https://www.ams.org/mathscinet-getitem?mr=MR1209958">CLLT93</a></span>] <b class='BibAuthor'>Chan, S.-P., Lang, M.-L., Lim, C.-H. and Tan, S. P.</b>,
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<p><a id="biBKulkarni" name="biBKulkarni"></a></p>
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[<span class='BibKeyLink'><a href="https://www.ams.org/mathscinet-getitem?mr=MR1137534">Kul91</a></span>] <b class='BibAuthor'>Kulkarni, R. S.</b>,
<i class='BibTitle'>An arithmetic-geometric method in the study of the subgroups
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<p><a id="biBLLT-Algorithm" name="biBLLT-Algorithm"></a></p>
<p class='BibEntry'>
[<span class='BibKeyLink'><a href="https://www.ams.org/mathscinet-getitem?mr=MR1332886">LLT95a</a></span>] <b class='BibAuthor'>Lang, M.-L., Lim, C.-H. and Tan, S. P.</b>,
<i class='BibTitle'>An algorithm for determining if a subgroup of the modular
group is congruence</i>,
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<p><a id="biBLLT-Hecke" name="biBLLT-Hecke"></a></p>
<p class='BibEntry'>
[<span class='BibKeyLink'><a href="https://www.ams.org/mathscinet-getitem?mr=MR1363856">LLT95b</a></span>] <b class='BibAuthor'>Lang, M.-L., Lim, C.-H. and Tan, S. P.</b>,
<i class='BibTitle'>Independent generators for congruence subgroups of Hecke
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