to decide
whether you want to comply with this request or not.)  For general
publications, we suggest referencing: Matteo Frigo and Steven
G. Johnson, &ldquo;The design and implementation of FFTW3,&rdquo;
<i>Proc. IEEE</i> <b>93</b> (2), 216&ndash;231 (2005).
</p>
<p>Non-free versions of FFTW are available under terms different from those
of the General Public License. (e.g. they do not require you to
accompany any object code using FFTW with the corresponding source
code.)  For these alternative terms you 