@misc{eli2025a,
  title = {Evaluation of opal photonic crystal films for application in non-destructive testing},
  author = {Eli Simova, Krassimir Stoev, Hiroshi Fudouzi},
  publisher = {NDT.net GmbH & Co. KG},
  year = {2025-07-01},
  keywords = {Colloidal Crystal, Opal, Structural Color, Strain Imaging, Non-Destructive Testing, Photonic Sheet}
}