diff --git a/README.md b/README.md
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 [TPE sur le sonar](https://tpesonaretdauphin.weebly.com/)
 
 ### Phénomène piézo électrique
-[Genral](http://www.geniemeca.fpms.ac.be/Recherche/recherche_piezoelectrique.htm)
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+[Genral](http://www.geniemeca.fpms.ac.be/Recherche/recherche_piezoelectrique.htm)
+
+### Cartes et besoin
+
+[DEEP  OCEAN  FLOOR  MAPPING FOR  SCIENTIFIC  PURPOSES AND  THE  APPLICATION  OF  AUTOMATIC  CARTOGRAPHY by A.S. Laughton, D.G. Roberts and R. Graves / National  Institute  of  Oceanography,  Wormley,  Godalming,  Surrey,  U.K](https://journals.lib.unb.ca/index.php/ihr/article/viewFile/23843/27628) 
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