http://lagouge.ecole-alsacienne.org/11-12/cahier_texte_TS4/Documents/Doc%20Vallee%20stabilite%20ML.pdf
diag_de_Segr_
simulateur: http://www.ostralo.net/3_animations/swf/diagrammeNZ_2.swf ou http://www.ostralo.net/3_animations/swf/diagrammeNZ_1.swf
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