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A shell is simply a plate with some curvature; it also supports wave motion, but the curvature complicates the motion considerably. As we will see, however, certain types of shell systems can also be represented by (2+1)D MDKCs. We will look first at the so-called cylindrical membrane shell formulation , then at a more modern (and elaborate) cylindrical shell formulation due to Naghdi and Cooper [31,128].