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2. Fjørtoft, R. , 1951: Report on work at U.C.L.A. Department of Meteorology under contract (W28-099 ac-403).
3. Perturbation of infinite wavelength of a linear flow with a harmonic velocity profile;Høiland;Videnskaps-Akademiets Institutt for Vœr- og Klimaforskning Rapport nr.,1952
4. Dynamic instability of two-dimensional nondivergent flow in a barotropic atmosphere;Kuo;J. Meteor.,1949