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2. Teoriia gidrodinamicheskoi ustoichivosti;Lin,1958
3. Turbulenz bei Warmeschichtung;Schlichting;ZAMM,1935
4. Two-dimensional Perturbation of a Flow with Constant Shear;Eliassen;Inst. for weather and climate res., Publ. 1,1953
5. Effect of variation in density on the stability;Taylor,1931