<li><a href="https://rosettacode.org/">Rosetta Code</a> was used for:
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              <li><a href="https://rosettacode.org/wiki/Greatest_common_divisor#JavaScript">gdc</a>,</li>
              <li><a href="https://rosettacode.org/wiki/Least_common_multiple#JavaScript">lcm</a>,</li>
              <li><a href="https://rosettacode.org/wiki/Convert_decimal_number_to_rational">LFloat::toRational</a>.</li>