URL https://www.researchgate.net/profile/Patrizio-Graziosi/publication/361486948/figure/fig18/AS:1184230017122317@1659353846747/Schematic-of-two-bands-one-with-many-valleys-in-blue-and-one-single-valley-in-red_Q320.jpg
URL2 https://www.researchgate.net/figure/Representation-in-Cartesian-axes-of-a-3-3-3-Monkhorst-Pack-grid-that_fig5_361486948
