[Mp4-tech] looking for documents related to "low complexity transform and quantization" in AVC standard

[Xiaowei Ding, Michael]

Dear experts,
I am looking for documents about "low complexity transform" in AVC
standard... I want to understand "WHY it can be derived into such a way,
from the optimal KLT, and the currently used DCT..."
I hope I can find some of the early documents showing the evolution path
of this low complexity transform technique...
Can anybody give me a pointer for where can I find such documents?
Thanks a lot,
-Michael.
(p.s., is the FTP site "standard(s).pictel.com" down these days? I
cannot ftp onto it recently...)