@conference {535,
	title = {Collaborative Design of Educational Digital Resources for Promoting Creative Mathematical Thinking},
	booktitle = {13th International Congress on Mathematical Education},
	year = {2016},
	month = {07/2016},
	address = {Hamburg - Germany},
	author = {Jana Trgalov{\'a} and Mohamed El-Demerdash and Oliver Labs and Jean-Fran{\c c}ois Nicaud}
}
@proceedings {461,
	title = {Characterization of preservice teachers{\textquoteright} patterns of metacognitive behavior and the use of Geometer{\textquoteright}s Sketchpad},
	journal = {The didactics of mathematics: Approaches and issues. A Hommage to Mich{\`e}le Artigue},
	year = {2012},
	publisher = {Universit{\'e} Paris Diderot},
	address = {Paris},
	author = {Ana Kuzle and Michelle Artigue}
}
@book {RicKor-CMWWIGS-2011,
	title = {The Cinderella.2 Manual {\textendash} Working with the Interactive Geometry Software},
	year = {2012},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	keywords = {software},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}
}
@proceedings {KorLamZei-CPATM-2011,
	title = {Computerwerkzeuge und Pr{\"u}fungen / Aufgaben mit Technologieeinsatz im Mathematikunterricht. Bericht {\"u}ber die 24. und 25. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik},
	year = {2011},
	publisher = {Franzbecker},
	address = {Hildesheim},
	keywords = {herausgeber},
	isbn = {978-3-88120-822-2},
	editor = {Kortenkamp, Ulrich and Lambert, Anselm and Zeimetz, Antonia}
}
@unpublished {LibKorMer-CCBWLTIGR-2010,
	title = {Crossing Cultural Boundaries with Long Term Interactive Geometry Resources},
	year = {2010},
	note = {Unpublished Manuscript},
	keywords = {sonstige},
	author = {Libbrecht, Paul and Kortenkamp, Ulrich and Mercat, Christian}
}
@booklet {RicKor-COGP-2008,
	title = {Cinderella {\textendash} {O}nline-{E}xperimente der {G}eometrie und {P}hysik},
	year = {2008},
	keywords = {sonstige},
	url = {http://www.imaginary2008.de},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich},
	editor = {Greuel, Gert-Martin}
}
@article {KorRic-CGPD-2008,
	title = {Cinderella.2 {\textendash} Geometrie und Physik im Dialog},
	journal = {Computeralgebra-Rundbrief},
	year = {2008},
	keywords = {lehrer},
	url = {http://kortenkamps.net/papers/2008/Rundbrief-CA-Kortenkamp.pdf},
	author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}
}
@conference {Kor-DOWBM-2007,
	title = {{CAS} und {DGS} im {D}ialog {\textendash} oder: Wieviel {CAS} braucht der {M}ensch?},
	booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 41. Tagung f{\"u}r Didaktik der Mathematik in Berlin},
	year = {2007},
	publisher = {Franzbecker},
	organization = {Franzbecker},
	address = {Hildesheim},
	keywords = {invited},
	url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Kortenkamp.pdf},
	author = {Kortenkamp, Ulrich}
}
@conference {SpaKor-CWFUK-2007,
	title = {CleverPHL {\textendash} ein Werkzeug zum flexiblen Umgang mit Konstruktionsprozessen in DGS},
	booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 41. Tagung f{\"u}r Didaktik der Mathematik in Berlin},
	year = {2007},
	publisher = {Franzbecker},
	organization = {Franzbecker},
	address = {Hildesheim},
	keywords = {invited},
	url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Spannagel_\%20Kortenkamp.pdf},
	author = {Spannagel, Christian and Kortenkamp, Ulrich}
}
@inbook {Kor-CTAT-2007,
	title = {Combining {CAS} and {DGS} {\textendash} {T}owards {A}lgorithmic {T}hinking},
	booktitle = {Symbolic Computation and Education},
	year = {2007},
	pages = {150-173},
	publisher = {World Scientific},
	organization = {World Scientific},
	address = {Singapore},
	abstract = {This article discusses some ways to combine software for interactive geometry and computer algebra, with an emphasis on using this software in teaching. Some arising mathematical problems and necessary software specific paradigms that have to be adjusted are considered, and solutions to these problems are presented. The article also highlights some of the aspects that drove the development of the mathematics software Cinderella.2, which integrates an interactive geometry software package, a physics simulation engine, and an all-purpose functional programming language.},
	keywords = {refereed},
	author = {Kortenkamp, Ulrich},
	editor = {Li, Shangzhi and Wang, Dongming and Zhang, Jing-Zhong}
}
@conference {RicKor-CIDG-2002,
	title = {Complexity issues in Dynamic Geometry},
	booktitle = {Foundations of Computational Mathematics (Proceedings of the Smale Fest 2000)},
	year = {2002},
	note = {Also available as technical report TRB-2000/22, Freie Universit{\"a}t Berlin},
	publisher = {World Scientific},
	organization = {World Scientific},
	abstract = {<p>
	This article deals with the intrinsic complexity of tracing and reachability questions in the context of elementary geometric constructions. We consider constructions from elementary geometry as dynamic entities: while the free points of a construction perform a continuous motion the dependent points should move consistently and continuously. We focus on constructions that are entirely built up from join, meet and angular bisector operations. In particular the last operation introduces an intrinsic ambiguity: Two intersecting lines have two different angular bisectors. Under the requirement of continuity it is a fundamental algorithmic problem to resolve this ambiguity properly during motions of the free elements. After formalizing this intuitive setup we prove the following main results of this article: It is NP-hard to trace the dependent elements in such a construction. It is NP-hard to decide whether two instances of the same construction lie in the same component of the configuration space. The last problem becomes PSPACE-hard if we allow one additional sidedness test which has to be satisfied during the entire motion. On the one hand the results have practical relevance for the implementations of Dynamic Geometry Systems. On the other hand the results can be interpreted as statements concerning the intrinsic complexity of analytic continuation.</p>
},
	keywords = {refereed},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.},
	editor = {Cucker, Felipe and Rojas, J. Maurice}
}
@book {RicKor-CPIG-2001,
	title = {Cinderella {\textendash} Programa interactivo di Geometria},
	year = {2001},
	note = {Portuguese translation.},
	publisher = {CMAFUL},
	organization = {CMAFUL},
	address = {Lisbon},
	keywords = {software},
	url = {http://cinderella.lmc.fc.ul.pt},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}
}
@book {RicH.K-CSIG-2001,
	title = {Cinderella {\textendash} {S}oftware interattivo di geometria},
	year = {2001},
	note = {Italian translation.},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	address = {Mailand},
	keywords = {software},
	author = {Richter-Gebert, J{\"u}rgen and H.~Kortenkamp, Ulrich}
}
@book {RicKor-CIG-2000,
	title = {Cinderella {\textendash} die interaktive {G}eometriesoftware},
	series = {Clever lernen {\textendash} super Noten!},
	year = {2000},
	publisher = {HEUREKA-Klett Softwareverlag},
	organization = {HEUREKA-Klett Softwareverlag},
	address = {Stuttgart},
	keywords = {software},
	url = {http://cinderella.de},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}
}
@article {RicH.K-CNU-2000,
	title = {Cinderella {\textendash} Nachmittagssoftware im Unterricht?},
	journal = {Rundgang},
	volume = {2},
	year = {2000},
	month = {jun},
	publisher = {Klett und Balmer},
	keywords = {lehrer},
	url = {http://www.cinderella.de/papers/rundgang0200.pdf},
	author = {Richter-Gebert, J{\"u}rgen and H.~Kortenkamp, Ulrich}
}
