2017c</a>]
</dt>
<dd>
Murrell, P. (2017c).
 <em>vwline: Draw variable-width lines</em>.
 R package version 0.1.
[ <a href="offset-xspline-bib_bib.html#vwline-pkg">bib</a> ]

</dd>


<dt>
[<a name="yacas">Pinkus and Winitzki, 2002</a>]
</dt>
<dd>
Pinkus, A. Z. and Winitzki, S. (2002).
 Yacas: A do-it-yourself symbolic algebra environment.
 In <em>Proceedings of the Joint International Conferences on
  Artificial Intelligence, Automated Reasoning, and Symbolic Computation</em>, AISC
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