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F. Sauerzopf:
"A geometrical approach to the summation of dilute pinning forces";
Physica C: Superconductivity and its Applications, 460-462 (2007), 1194 - 1195.

A new approach to handle the summation problem of pinning forces is presented. The model estimates the geometrical properties of
the vortex displacement from calculations within the elastic theory of the vortex lattice. Considering the average movement of vortices
under the influence of the pinning force the average force per pinning centre is found from simple geometrical considerations. At present,
the calculation is based on a numerical iteration process.