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Article Contents

ABSTRACT

1.INTRODUCTION

2. HISTORY
2.1. Discovery
2.2. Doubts and Confirmation

3. CURRENT STATUS
3.1. Observational Methods and Results
3.2. Slope as a Function of Ionization

4. DETAILED LUMINOSITY EFFECTS
4.1. The Importance of Luminosity Range
4.2. Second Order Effects

5. VARIABLE LUMINOSITY
5.1. The Intrinsic BE
5.2. The Intrinsic versus Ensemble BE

6. FURTHER SYSTEMATICS AND PHENOMENOLOGY
6.1. Line Profile Issues
6.2. Radio-loud versus Radio-quiet
6.3. The X-ray BE

7. THE BALDWIN EFFECT AT HIGH REDSHIFT
7.1. Evidence of Evolution
7.2. Preliminary Results at z > 4

8. SUMMARY AND FUTURE DIRECTIONS

REFERENCES