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<title>GAP (Congruence) - References</title>
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<h3>References</h3>


<p><a id="biBCLT" name="biBCLT"></a></p>
<p class='BibEntry'>
[<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>,
 <i class='BibTitle'>Special polygons for subgroups of the modular group and
              applications</i>,
 <span class='BibJournal'>Internat. J. Math.</span>,
 <em class='BibVolume'>4</em> (<span class='BibNumber'>1</span>)
 (<span class='BibYear'>1993</span>),
 <span class='BibPages'>11--34</span>.
</p>


<p><a id="biBKulkarni" name="biBKulkarni"></a></p>
<p class='BibEntry'>
[<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
              of the modular group</i>,
 <span class='BibJournal'>Amer. J. Math.</span>,
 <em class='BibVolume'>113</em> (<span class='BibNumber'>6</span>)
 (<span class='BibYear'>1991</span>),
 <span class='BibPages'>1053--1133</span>.
</p>


<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>,
 <span class='BibJournal'>J. London Math. Soc. (2)</span>,
 <em class='BibVolume'>51</em> (<span class='BibNumber'>3</span>)
 (<span class='BibYear'>1995</span>),
 <span class='BibPages'>491--502</span>.
</p>


<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
              groups</i>,
 <span class='BibJournal'>Math. Z.</span>,
 <em class='BibVolume'>220</em> (<span class='BibNumber'>4</span>)
 (<span class='BibYear'>1995</span>),
 <span class='BibPages'>569--594</span>.
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