@conference {fwan, title = {A Two-Stage Codebook Building Method Using Fast WAN}, booktitle = {International Conference on Image Analysis and Processing (ICIAP)}, year = {1999}, month = {September}, pages = {1047{\textendash}1050}, publisher = {IEEE Computer Society}, organization = {IEEE Computer Society}, address = {Venice, Italy}, author = {F{\'e}lix Balado and O.W. M{\'a}rquez} }