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Article Contents

TITLE PAGE

1.INTRODUCTION

2.CENTRAL ENGINE MODELS

2.1.Why Supermassive Black Holes?

2.2.Hydrodynamic Beam Production

2.3.Magnetohydrodynamical Models

3.OBSERVATIONS OF JETS ON EXTREMELY SMALL SCALES

3.1.Better Evidence for Black Holes

3.2.Direct Evidence Concerning Extremely Small Objects

3.3.Interactions Between Jets and the Ambient Nuclear Medium

4.CONCLUSIONS

REFERENCES