Decreasing returns to scale: r=0.5

Increasing returns to scale: r=1.5

Constant returns to scale: r=1

Constant returns to scale with asymmetric weighting: r=1, lambda=0.8

Constant returns to scale with asymmetric productivity/utility: r=1, T=2

Literature and further reading:
The Structure of Economics, 3rd ed., Eugene Silberberg
MATLAB Documentation, MathWorks
Anatomy of Cobb-Douglas Functions in 3D
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How to cite: Fuleky, P. (2006). Anatomy of a Constant Elasticity of Substitution Type Production/Utility Function in Three Dimensions. Mimeo, University of Washington, October 2006.
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