1 Correction to: Optical Review https://doi.org/10.1007/s10043-021-00673-5

In the original publication Reference 3 has been published incorrectly. The correct Reference 3 is given in this Correction.


3. Pernick, B.J., et al.: Optical method for fatigue crack detection. Appl. Opt. 19(18), 3224–3229 (1980).


The original article has been corrected.