<?xml version="1.0"?>
<dblp>
<inproceedings key="conf/chi/CockburnKAZ07" mdate="2007-06-25">
<author>Andy Cockburn</author>
<author>Per Ola Kristensson</author>
<author>Jason Alexander</author>
<author>Shumin Zhai</author>
<title>Hard lessons: effort-inducing interfaces benefit spatial learning.</title>
<pages>1571-1580</pages>
<year>2007</year>
<crossref>conf/chi/2007</crossref>
<booktitle>CHI</booktitle>
<ee>http://doi.acm.org/10.1145/1240624.1240863</ee>
<url>db/conf/chi/chi2007.html#CockburnKAZ07</url>
</inproceedings>
</dblp>
