I. Biswas, On the fundamental group-scheme, Bulletin des Sciences Math??matiques, vol.133, issue.5, pp.477-483, 2009.
DOI : 10.1016/j.bulsci.2008.11.002
URL : https://hal.archives-ouvertes.fr/hal-01342088

F. Campana, Connexit?? rationnelle des vari??t??s de Fano, Annales scientifiques de l'??cole normale sup??rieure, vol.25, issue.5, pp.539-545, 1992.
DOI : 10.24033/asens.1658

A. Chambert-loir, A propos du groupe fondamental des variétés rationnellement connexes, C. R

A. Chambert-loir, Points rationnels et groupes fondamentaux: applications de la cohomologie p-adique (d'après, Astérisque No, pp.125-146, 2004.

P. Deligne, Th??orie de Hodge, II, Publications math??matiques de l'IH??S, vol.2, issue.1, pp.5-57, 1971.
DOI : 10.1007/BF02684692

H. Esnault, P. H. Hai, and X. Sun, On Nori???s Fundamental Group Scheme, Progr. Math, vol.265, pp.377-398, 2008.
DOI : 10.1007/978-3-7643-8608-5_8

J. Kollár, Shafarevich maps and plurigenera of algebraic varieties Invent, Math, vol.113, pp.177-215, 1993.

J. Kollár, Y. Miyaoka, and S. Mori, Rational connectedness and boundedness of Fano manifolds, Journal of Differential Geometry, vol.36, issue.3, pp.765-779, 1992.
DOI : 10.4310/jdg/1214453188

Q. Liu, Algebraic geometry and arithmetic curves, Oxford Graduate Texts in Mathematics, vol.6, 2006.
URL : https://hal.archives-ouvertes.fr/hal-00194204

V. Mehta and S. Subramanian, On the fundamental group scheme, Inventiones Mathematicae, vol.148, issue.1, pp.143-150, 2002.
DOI : 10.1007/s002220100191

M. V. Nori, On the representations of the fundamental group, Compos. Math, vol.33, pp.29-42, 1976.

M. V. Nori, The fundamental group-scheme, Proceedings Mathematical Sciences, vol.17, issue.2, pp.73-122, 1982.
DOI : 10.1007/BF02967978

T. Shioda, An example of unirational surfaces in characteristicp, Mathematische Annalen, vol.46, issue.3, pp.233-236, 1974.
DOI : 10.1007/BF01350715

W. C. Waterhouse, Introduction to affine group schemes, Graduate Texts in Mathematics, 1979.

Y. Zhu, Fano hypersurfaces in positive characteristic

J. A. Laboratoire, U. Dieudonné, and . Cnrs-uns, Parc Valrose, 06108 NICE Cedex 2, France E-mail address: Marco, ANTEI@unice.fr School of Mathematics