1. Alfvén , H. 1950 Cosmical Electrodynamics. Oxford
2. Bartlett , M. S. 1946 Stochastic Processes. Mimeographed N. Carolina lecture notes.
3. On the Theory of Stationary Random Processes
4. Frisch , R. 1938 Statistical versus Theoretical Relationships in Economic Macrodynamics. Mimeographed memorandum.