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Article Contents

TITLE PAGE

INTRODUCTION

I.LINDBLAD'S ERA

1.1.From unstable orbits to global wave modes

1.2.Gas and dust

1.3.Winds of change

1.4.Dispersion orbits

1.5.Circulation theory of quasi-stationary spirals

II.ON A NEW WAVE CREST

2.1.Regenerative spirals by Lynden-Bell

2.2.MIT enthusiasm

2.3.Gravitational stability of flat systems

2.4.Kalnajs' search for spiral modes

III.THE LIN-SHU THEORY

3.1.Working hypothesis and semi-empirical theory

3.2.A definitive (?) new prediction

AFTERWORD

REFERENCES