@InProceedings{Suutala04a, author = {J. Suutala and S. Pirttikangas and J. Riekki and J. R\"oning}, title = {Reject-optional {LVQ}-based Two-level Classifier to Improve Reliability in Footstep identification}, booktitle = {Proceedings of 2nd International Conference on Pervasive Computing (PERVASIVE 2004)}, pages = {182-187}, year = {2004}, editor = {A. Ferscha and F. Mattern}, address = {Linz/Vienna, Austria}, month = {April 18-23}, series = {Lecture Notes in Computer Science}, volume = {3001}, publisher = {Springer-Verlag}, }