網址: https://www.researchgate.net/profile/T-K-Sandeep-Kumar/publication/349471492/figure/fig3/AS:995394217574400@1614331883497/Macro-and-microstructures-of-reference-pellets-categorised-as-Type-3-The-images-at-200.png
網址2: https://www.researchgate.net/figure/Macro-and-microstructures-of-reference-pellets-categorised-as-Type-3-The-images-at-200_fig3_349471492
