\providecommand{\bysame}{\leavevmode\hbox to3em{\hrulefill}\thinspace}
\providecommand{\MR}{\relax\ifhmode\unskip\space\fi MR }
% \MRhref is called by the amsart/book/proc definition of \MR.
\providecommand{\MRhref}[2]{%
  \href{http://www.ams.org/mathscinet-getitem?mr=#1}{#2}
}
\providecommand{\href}[2]{#2}
\begin{thebibliography}{GHMS05}

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B.~J. Birch, \emph{Forms in many variables}, Proc. Roy. Soc. Ser. A
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J.~W. Bruce and C.~T.~C. Wall, \emph{On the classification of cubic surfaces},
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A.~Corti, \emph{Del {P}ezzo surfaces over {D}edekind schemes}, Ann. of Math.
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\bibitem[CTG04]{CTG}
J.~L. Colliot-Th{\'e}l{\`e}ne and P.~Gille, \emph{Remarques sur l'approximation
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\bibitem[dJS06]{dJS}
A.J. de~Jong and J.~Starr, \emph{Low degree complete intersections are
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\bibitem[GH78]{GH}
P.~Griffiths and J.~Harris, \emph{Principles of algebraic geometry},
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\bibitem[GHMS05]{GHMS}
T.~Graber, J.~Harris, B.~Mazur, and J.~Starr, \emph{Rational connectivity and
  sections of families over curves}, Ann. Sci. \'Ecole Norm. Sup. (4)
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\bibitem[GHS03]{GHS}
T.~Graber, J.~Harris, and J.~Starr, \emph{Families of rationally connected
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\bibitem[HMP98]{HMP}
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  Duke Math. J. \textbf{95} (1998), no.~1, 125--160. \MR{1646558 (99j:14043)}

\bibitem[HT06]{HT06}
B.~Hassett and Y.~Tschinkel, \emph{Weak approximation over function fields},
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\bibitem[HT08]{HT05}
\bysame, \emph{Approximation at places of bad reduction for rationally
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\bibitem[Kol96]{kollar}
J.~Koll{\'a}r, \emph{Rational curves on algebraic varieties}, Ergebnisse der
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\bibitem[PS92]{PS}
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  threefolds (J.~Koll\'ar, ed.), Ast\'erisque, no. 211, Soci\'et\'e
  Math\'ematique de France, Paris, 1992, pp.~241--248. \MR{1225842 (94f:14013)}

\bibitem[Ski97]{Skinner}
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\bibitem[Zha06]{zhang}
Q.~Zhang, \emph{Rational connectedness of log {${\bf Q}$}-{F}ano varieties}, J.
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\end{thebibliography}