@inproceedings{WZK2006,
author = {D. Wang and  X.-J. Zeng and  J.A. Keane},
title = {Learning for hierarchical fuzzy systems based on the gradient-descent method},
booktitle = {2006 IEEE International Conference on Fuzzy Systems({FUZZ-IEEE06})},
city = {Vancouver},
country = {Canada},
pages = {92--99},
year = {2006}
}