Frequency Domain Normal Map Filtering Charles Han, Bo Sun, Ravi Ramamoorthi, and Eitan Grinspun, SIGGRAPH (ACM Transactions on Graphics), pp.28, 2007.
@Article{CG_0123,
author = {Charles Han and Bo Sun and Ravi Ramamoorthi and Eitan Grinspun},
title = {{F}requency {D}omain {N}ormal {M}ap {F}iltering},
journal = {SIGGRAPH (ACM Transactions on Graphics)},
volume = {26},
number = {3},
pages = {28},
month = {Jul},
year = {2007}
}