@article{physicallyinformedfuzzyclusteringofverti,
  title = {Physically-Informed Fuzzy Clustering of Vertical Sounding Ionograms},
  author = {Oleg I. Berngardt and Sergey N. Ponomarchuk},
  year = {2026},
  eprint = {2604.27721},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2604.27721},
}