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Article Contents
1 Introduction
2 Envelope integrations
3 Sensitiveness of extended AGB envelopes to the C/O ratio
4 TP-AGB evolutionary calculations
5 Dependence on mass and metallicity
6 The evolution of lithium-rich carbon stars
7 Weighing the impact of the new results
8 Cautionary remarks
9 Summary and conclusions

List of figures

Copyright ESO 2007
Published by EDP Sciences