1. Group Velocity of Spiral Waves in Galactic Disks;Toomre;Astrophys. J,1969
2. The Spiral Wave of Our Galaxy Near Inner Lindblad Resonance;Mark;Proc. Nat. Acad. Sci.,1971
3. The Spiral Structure of our Galaxy;Lin,1970
4. Theory of Spiral Structure;Lin;Highlights of Astronomy,1970
5. On the Spiral Structure of Disk Galaxies. III. Comparison with Observations;Lin;Astrophys. J.,1969