1. Dispersion Relations in Rarefied Gas Dynamics
2. H. Grad,Principles of the Kinetic Theory of Gases, inHandbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, Germany, 1958), Vol. 12.
3. C. S. Wang Chang, and G. E. Uhlenbeck “On the Propagation of Sound in Monatomic Gases,” Engineering Research Institute, University of Michigan (1952). This important report contains the first investigation of the linearized Boltzmann Equation and the attendant eigentheory.
4. Symmetric hyperbolic linear differential equations
5. H. L. Hamburger and M. E. Grimshaw,Linear Transformations in n-Dimensional Vector Space(Cambridge University Press, 1951). For results in linear algebra one is referred to this volume.