Ai, Daniel Kwoh-i (1961) Part I. Cylindrical Couette Flow in a Rarefied Gas According to Grad's Equation. Part II. Small Perturbations in the Unsteady Flow of a Rarefied Gas Based on Grad's Thirteen Moment Approximation (Dissertation (Ph.D)), California Institute of Technology doi: 10.7907/9P2N-HF23