%0 Journal Article
%A Anders Kock
%T Projective lines as groupoids with projection structure
%J Theory and applications of categories
%D 2014
%P 371-388
%V 29
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TAC_2014_29_a12/
%G en
%F TAC_2014_29_a12