참고문헌
- Pauli L, Heikki R, Tapio S, Hannu H, Jani R (2014) Influence of grain size distribution on the Hall-Petch relationship of welded structural steel. Materials Science & Engineering A. 592, 28-39. https://doi.org/10.1016/j.msea.2013.10.094
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Sobel I, Feldman G (1968) A 3
${\times}$ 3 isotropic gradient operator for image processing. a talk at the Stanford Artificial Project.