[Wien] Refenence for LSDA functional

[sonusharma at iitmandi.ac.in]

Respected Sir
I am using the latest version of WIEN2k_13.1 code. There are different
option for exchange correlation functional. I want to know the reference
for the LSDA functional implemented in this code.

Thanks and regards.
Dr. Sonu Sharma
IIT Mandi (H.P.)
India