\input zb-basic
\input zb-ioport
\iteman{io-port 50129943}
\itemau{Mart{\'\i}n, Domingo; Arroyo, Germ\'an; Luz\'on, M. Victoria; Isenberg, Tobias}
\itemti{Scale-dependent and example-based grayscale stippling}
\itemso{Computers & Graphics 35, No. 1, 160-174 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.cag.2010.11.006}
\end