In the article of W. H. Chang "Numerical Calculation of the Inductances of a Multi-Superconductor Transmission Line System," IEEE Trans. Magn. 1981, vol. 17, N1, pp. 216-239, the numerical approach for the inductances of superconductor TL was presented.
Here is our reconstruction of this technique, with some improvements.
Different version of this technique can be found here.
Unfortunately approach based on the volume integral equations independently of realization appeared to be time and memory consuming, sensitive for grid changes and not numerically stable enough. The better program appeared to be LL.