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2. Uber das Spectrum bei Eigenschwingungen ebener Laminarstromungen;Grohne;Z.angew.Math.u.Mech.,1954
3. On the problem of hydrodynamic stability. I. Uniform shearing motion in a viscous liquid;Southwell;Phyl.Trans.Roy.Soc., ser.A,1930
4. On the stability of a plane-parallel Couette flow;Dikii;PMM,1964