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Article Contents

ABSTRACT

1.INTRODUCTION: LARGE-SCALE SHELLS

2.SHELL EXPANSION

3.TRIGGERING: BRIGHT RIMMED CLOUDS AND PILLARS

4.AGE SEQUENCES IN BRIGHT RIMS

5.SHELL EXPANSION: COLLECT AND COLLAPSE

6.GENERAL ASPECTS OF TRIGGERING

7.ISM ENERGY SOURCES THAT MAY TRIGGER STAR FORMATION

8.SUMMARY

REFERENCES