 (2016).
 <em>Ryacas: R Interface to the Yacas Computer Algebra System</em>.
 R package version 0.3-1.
[ <a href="offset-xspline-bib_bib.html#Ryacas">bib</a> | 
<a href="https://CRAN.R-project.org/package=Ryacas">http</a> ]

</dd>


<dt>
[<a name="polyclip">Johnson and Baddeley, 2017</a>]
</dt>
<dd>
Johnson, A. and Baddeley, A. (2017).
 <em>polyclip: Polygon Clipping</em>.
 R package version 1.6-1.
[ <a href="offset-xspline-bib_bib.html#polyclip">bib</a> | 
<a href="https://CRAN.R-project.org/package=p