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\centerline{\bigbf R\'ef\'erences}
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Nous renvoyons au site officiel [4] {\tt http://www.mcescher.com/ } pour des
r\'ef\'erences exhaustives \`a l'{\oe}uvre de M.C.\ Escher. L'image du
pavage hyperbolique du disque due \`a Escher est tir\'ee du site de
Jos Leys [6]. Les autres images proviennent du domaine public ou
de sites libres de droit (Wikipedia...).
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{\leftskip=1.5cm

\bibitem [1]&D.\ Cox, S. Katz&Mirror Symmetry and Algebraic 
Geometry&Mathematical Surveys and Monographs, Vol.\ {\bf 68},
Amer.\ Math.\ Soc., 1999&

\bibitem [2]&J.\ Bertin, J.-P.\ Demailly, L.\ Illusie, C.\ Peters&
Introduction \`a la th\'eorie de Hodge& Panoramas et Synth\`eses, n$^0$ 3,
Soc. Math. de France, 1996, 267$\,$p$\,$;
{\it Introduction to Hodge Theory}, SMF/AMS Texts and Monographs, 
Vol.\ 8, 232$\,$p$\,$;\\
{\tt http://www-fourier.ujf-grenoble.fr/\~{}demailly/books.html}, [B3]&

\bibitem [3]&J.-P.\ Demailly&Complex analytic and differential geometry&\\
{\tt http://www-fourier.ujf-grenoble.fr/\~{}demailly/books.html}, [B1]&

\bibitem [4]&M.C.\ Escher&Official website&{\tt http://www.mcescher.com/}&

\bibitem [5]&P.A.\ Griffiths, J.\ Harris&Principles of algebraic 
geometry&Wiley, New York, 1978&

\bibitem [6]&J.\ Leys&Mathematical imagery&The M.C.Escher flavoured pages,\\
{\tt http://www.josleys.com/galleries.php?catid=6}&

\bibitem [7]&M. Spivak&A Comprehensive Introduction to Differential 
Geometry&Volumes {\bf 1--5}, Publish or Perish, Inc., 3rd Edition, 1991&

\bibitem [8]&C.\ Voisin&Th\'eorie de Hodge et g\'eom\'etrie alg\'ebrique 
complexe&Collection cours sp\'ecialis\'es, Soc.\ Math.\ France, 2004&

\bibitem [9]&C.\ Voisin&Sym\'etrie miroir&Panoramas et 
Synth\`eses, Vol.\ {\bf 2}, Soc.\ Math.\ France, 1996, 152$\,$p;
{\it Mirror Symmetry}, American Mathematical Society
(SMF/AMS Texts and Monographs, Vol.\ {\bf 1}), 1996&

\bibitem [10]&E.\ Witten&Magic, Mystery, and
Matrix&Notices of the AMS, Vol.\ {\bf 45} (1998) 1124--1129, 
{\tt http://www.sns.ias.edu/\~{}witten/papers/mmm.pdf}&

}

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