@phdthesis{discovery10020257,
            year = {1996},
           title = {Constructing curvature : the iterative design of a computer-based microworld for non-Euclidean geometry.},
            note = {Thesis: (PhD) University of London 1996..},
          school = {Institute of Education, University of London},
          author = {Stevenson, Ian James.},
             url = {https://discovery.ucl.ac.uk/id/eprint/10020257/}
}