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Article Contents

ABSTRACT

1.INTRODUCTION

2.THE METHOD

3.MEASURING TIME DELAYS

4.Modeling strong galaxy lenses
4.1.The models
4.2.Modeling "quad" sources
4.3.Uncertainties in the models
4.4.The double quasar 0957+561

5.SYSTEMATIC ERRORS

6.IS A TEN PERCENT MEASUREMENT OF H0 ATTAINABLE?

REFERENCES