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Article Contents
1 Introduction
2 The binary system model
3 PKS 0420-014
4 Binary Black hole model for PKS 0420-014
5 Discussion
6 Conclusion
7 Appendix I: Precession in the three-body problem
8 Appendix II: The $\mathsf{d{\it z}/d{\it t}}$ equation
References
Copyright ESO 2001
Published by EDP Sciences