%0 Journal Article %A Chernousov, V. %T Variations on a theme of groups splitting by a quadratic extension and Grothendieck-Serre conjecture for group schemes $F_4$ with trivial $g_3$ invariant %J Documenta mathematica %D 2010 %P 147-169 %V Andrei A. Suslin's Sixtieth Birthday %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2010__S4__a17/ %G en %F DOCMA_2010__S4__a17