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Article Contents

TITLE PAGE

1.INTRODUCTION

2.SOME BASIC RELATIONS

3.SPECTRA
3.1.Effect of Opacity
3.2.Extensions of the Spectra to Infrared-Optical and Shorter Wavelengths

4.VARIABILITY
4.1.Flux Density Variations
4.2.Implications of the Observed Flux Density Variations
4.3.Polarization Variations
4.4.Optical and Infrared Variability

5.STRUCTURE
5.1.Extended Sources
5.2.Compact Sources

6.STRUCTURAL VARIATIONS
6.1.Stationary Sources
6.2.Superluminal Sources
6.3.Interpretation of Superluminal Motion

7.SPATIAL DISTRIBUTION

8.SUMMARY

REFERENCES