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Article Contents

ABSTRACT

1.INTRODUCTION

2.AGB STARS AS ISM POLLUTERS: ⁴He, Na AND THE EVOLUTION OF GLOBULAR CLUSTERS

3.AGB STARS AS ISM POLLUTERS: ³He, ¹²C and ¹³C

4.AGB STARS AS ISM POLLUTERS: NITROGEN VERSUS OXYGEN

5.THE NEED FOR IMPROVED YIELDS

REFERENCES