%0 Journal Article %A I. R. Shafarevich %T Principal homogeneous spaces defined over a~function field %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1961 %P 316-346 %V 64 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1961_64_a18/ %G ru %F TM_1961_64_a18