Bending energy of vesicle membranes: General expressions for the first, second, and third variation of the shape energy and applications to spheres and cylinders.

@article{Zhongcan1989BendingEO,
  title={Bending energy of vesicle membranes: General expressions for the first, second, and third variation of the shape energy and applications to spheres and cylinders.},
  author={Zhong-can and Helfrich},
  journal={Physical review. A, General physics},
  year={1989},
  volume={39 10},
  pages={5280-5288}
}
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