@article{10_4153_CJM_2018_037_5,
     author = {Fahrner, Anne and Hausen, J\"urgen},
     title = {On {Intrinsic} {Quadrics}},
     journal = {Canadian journal of mathematics},
     pages = {145--181},
     year = {2020},
     volume = {72},
     number = {1},
     doi = {10.4153/CJM-2018-037-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2018-037-5/}
}