INTRODUCTION
I. LINDBLAD'S ERA
- From unstable orbits to global wave modes
Gas and dust
Winds of change
Dispersion orbits
Circulation theory of quasi-stationary spirals
II. ON A NEW WAVE CREST
- Regenerative spirals by Lynden-Bell
MIT enthusiasm
Gravitational stability of flat systems
Kalnajs' search for spiral modes
III. THE LIN-SHU THEORY
- Working hypothesis and semi-empirical theory
A definitive (?) new prediction
AFTERWORD
REFERENCES
