Reference
- BERGTHORSSON, P., and Döös, B., 1955: Numerical weather map analysis. Tellus, 7, pp. 329–340.
- GILCHRIST, B., and CRESSMAN, G. P., 1954: An experiment in objective analysis. Tellus, 6, pp. 309–318.
- RICHARDSON, N. N.: Licentiate thesis, University of Stockholm, 1961. (Unpublished.)