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Article Contents

ABSTRACT

1.HISTORICAL BACKGROUND

1.1.Initial models based on pressure and gravitational confinement

1.2.IGM as a fluctuating density field

1.3.Sources of ionization

2.OBSERVATIONAL CONSTRAINTS

2.1.Observations related to the state of the IGM

2.2.Observations related to the sources of reionization

3.PHYSICS OF REIONIZATION

3.1.Analytical approaches

3.2.Simulations

4.THE FUTURE

REFERENCES