@article{ukr,
author = {Peter Meinicke and Stefan Klanke and Roland Memisevic and Helge Ritter},
title = {Principal Surfaces from Unsupervised Kernel Regression},
journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence},
volume = {27},
number = {9},
year = {2005},
pages = {1379--1391},
publisher = {IEEE Computer Society},
address = {Washington, DC, USA},
}