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Article Contents
1 Introduction
2 Complex lensing notation
3 Compatibility relations
4 Brightness moments of source and image
5 Shear and flexion estimates
6 Numerical tests of flexion estimators
7 Conclusions and further work
Appendix A: The matrix C
Appendix B: Critical curves and caustics
References

List of figures

Copyright ESO 2008
Published by EDP Sciences