@article {LadKor-AAMTEML-2012,
	title = {An activity-theoretic approach to multi-touch tools in early maths learning},
	journal = {The International Journal for Technology in Mathematics Education},
	volume = {20},
	number = {1},
	year = {2013},
	abstract = {<p>
	In this article we present an activity theory based framework that can capture the complex situations that arise when modern technology like multi-touch devices are introduced in classroom situations. As these devices are able to cover more activities than traditional technologies, even computer-based, media, we have to accept that they now take a larger role in the model of interactions. We reflect this fact by moving the artefact into the centre of our observations, leading to an artefact-centric activity theory (ACAT). The theory was developed in the need of analysing learning environments for primary maths education.</p>
},
	keywords = {refereed},
	url = {http://www.tech.plym.ac.uk/research/mathematics_education/field\%20of\%20work/ijtme/volume_20/number_one.html$\#$one},
	author = {Ladel, Silke and Kortenkamp, Ulrich}
}
@conference {LadKor-AAMTEML-2011,
	title = {An activity-theoretic approach to multi-touch tools in early maths learning},
	booktitle = {Proceedings of ATATEMLO 2011 in Paris},
	year = {2011},
	keywords = {refereed},
	author = {Ladel, Silke and Kortenkamp, Ulrich}
}
@conference {Kor-AM-2008,
	title = {Algorithmen im Mathematikunterricht},
	booktitle = {Informatische Ideen im Mathematikunterricht. Bericht {\"u}ber die 23. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik},
	year = {2008},
	pages = {77{\textendash}86},
	publisher = {Franzbecker},
	organization = {Franzbecker},
	keywords = {invited},
	author = {Kortenkamp, Ulrich},
	editor = {Kortenkamp, Ulrich and Weigand, Hans-Georg and Weth, Thomas}
}
@article {Kor-AGU-2006,
	title = {Algorithmische {G}eometrie im {U}nterricht},
	journal = {Der Mathematikunterricht},
	volume = {52},
	number = {1},
	year = {2006},
	pages = {32-39},
	publisher = {Friedrich Verlag},
	address = {Hannover},
	keywords = {refereed},
	author = {Kortenkamp, Ulrich}
}
@conference {BreKor-ATGWIT-2004,
	title = {Advanced Teaching of Geometry with Interactive Tools},
	booktitle = {Proceedings of RIMS-Workshop ITMga 2003},
	number = {1378},
	year = {2004},
	publisher = {RIMS},
	organization = {RIMS},
	address = {Kyoto},
	abstract = {<p>
	In this article we will give a brief introduction into new ways of teaching that are possible with interactive geometry software, in particular with Cinderella, which has just become available in Japan.</p>
},
	keywords = {invited},
	url = {http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/25650/1/1378-9.pdf},
	author = {Brehm, Enno and Kortenkamp, Ulrich},
	editor = {Nagaoka, Ryosuke and Ishi, Hideyuki and Hitzer, Eckhard}
}
