@article{MM2_1995__86_3_156036,
     author = {D.W. Hoffmann and J. Van Geel},
     title = {Minimal forms with respect to function fields of conics.},
     journal = {Manuscripta mathematica},
     pages = {23--48},
     publisher = {mathdoc},
     volume = {86},
     number = {3},
     year = {1995},
     zbl = {0824.11022},
     url = {http://geodesic.mathdoc.fr/item/MM2_1995__86_3_156036/}
}