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Article Contents

ABSTRACT

1.INTRODUCTION

2.DEFINING THE EMGs

2.1.Luminosities: Basic Relations

2.2.From CO Luminosity to Molecular Mass

2.3.Classification of the EMGs

2.4.Examples of EMGs

3.DISCUSSION

3.1.Molecular Gas Mass and Star Formation Efficiency

3.2.Star Formation and Gas Depletion Lifetime

3.3.HCN, [CI], & [CII] Emission

3.4.Masses, Sizes, & Evolutionary Destiny

4.OBSERVATIONAL PROSPECTS

REFERENCES