@article{PMIHES_2011__114__1_0,
     author = {Jong, A. J. and He, Xuhua and Starr, Jason Michael},
     title = {Families of rationally simply connected varieties over surfaces and torsors for semisimple groups},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {1--85},
     publisher = {Springer-Verlag},
     volume = {114},
     year = {2011},
     doi = {10.1007/s10240-011-0035-1},
     zbl = {1285.14053},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1007/s10240-011-0035-1/}
}