@INPROCEEDINGS{Rebhan-ICANN-2007,
author = {Rebhan, Sven and Eggert, Julian and Gross, Horst-Michael and Koerner,
Edgar},
title = {Sparse and Transformation-Invariant Hierarchical {NMF}},
booktitle = {Artificial Neural Networks - ICANN 2007 (ICANN)},
year = {2007},
pages = {894--903},
volume = {4668},
number = {1},
series = {LNCS},
publisher = {Springer}
}