@article{10_4064_cm_75_1_53_78,
     author = {M. Szyjewski},
     title = {On the {Witt} ring of a relative projective line},
     journal = {Colloquium Mathematicum},
     pages = {53--78},
     publisher = {mathdoc},
     volume = {75},
     number = {1},
     year = {1998},
     doi = {10.4064/cm-75-1-53-78},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-75-1-53-78/}
}