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Article Contents

ABSTRACT

1.INTRODUCTION

2.GENESIS OF THE IDEA
2.1.Missing Mass in Galaxies
2.2.The Cosmological Context
2.3.Theoretical Difficulties
2.4.A Way Out

3.MECHANISMS OF LUMINOSITY-MASS SEGREGATION

4.OBSERVATIONAL TESTS
4.1.Tests of Biased Galaxy Formation

5.DISCUSSION

REFERENCES