Logic of ruler and compass constructions. Beeson, M. In Cooper, S. B., Dawar, A., & Loewe, B., editors, Computability in Europe 2012, volume 7318, of Theoretical Computer Science and General Issues, pages 46-55, Berlin Heidelberg, 2012. Springer-Verlag.  
Pdf  bibtex   @inproceedings{beeson2012,
	address = {Berlin Heidelberg},
	author = {Michael Beeson},
	booktitle = {Computability in Europe 2012},
	date-added = {2014-11-13 22:57:33 +0000},
	date-modified = {2014-11-14 18:30:35 +0000},
	editor = {S. Barry Cooper and Anuj Dawar and Benedict Loewe},
	keywords = {Geometry, Constructive mathematics},
	pages = {46-55},
	publisher = {Springer-Verlag},
	series = {Theoretical Computer Science and General Issues},
	title = {Logic of ruler and compass constructions},
	url_pdf = {Cambridge.pdf},
	volume = {7318},
	year = {2012}} 
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