https://research.ibm.com/publications/crossover-between-fractal-and-nonfractal-flux-penetration-in-high-temperature-superconducting-thin-films
Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin...
Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films for Physical Review B - CMMP by R. Surdeanu et al.