Article and talks.
We implemented computing Chern number and Z2 invariant codes. Z2 support page is here.
I implemented the interface code between CrySPY and OpenMX.
How to implement "Fukui-Hatsugai method" for computing Z2 invariant
We explain "Fukui-Hatsugai" method. ( T. Fukui and Y. Hatsugai, J. Phys. Soc. Jpn. 76, 053702 (2007). )