Here is list of publications from the QRS/ML project (Click on title to view pdf): 
 
by Tom Howley and Michael G. Madden. Proceedings of the International Conference on Artificial Neural Networks (ICANN), September 2006. 

"The Effect of Principal Component Analysis on Machine Learning Accuracy with High Dimensional Spectral Data"  
by Tom Howley, Michael G. Madden, Marie-Louise O’Connell and Alan G Ryder.  Knowledge Based Systems, 2006.
Also in: Proceedings of AI-2005, 25th International Conference on Innovative Techniques and Applications of Artificial Intelligence, Cambridge, December 2005.
  
by Tom Howley and Michael G. Madden. Artificial Intelligence Review, Volume 24, Numbers 3-4, 2005.

"Investigation into the use of PCA with Machine Learning for the Identification of Narcotics based on Raman Spectroscopy"
by Tom Howley, Michael G. Madden, Marie-Louise O’Connell and Alan G Ryder. Proc. AICS-05: Irish Conference on Artificial Intelligence and Cognitive Science, Portstewart, September 2005.
 
by Marie-Louise O'Connell, Tom Howley, Alan G. Ryder, Marc N. Leger & Michael G. Madden, Proceedings of OPTO-Ireland, April 2005.
 
by Tom Howley and Michael G. Madden. Proceedings of 15th Irish Conference on Artificial Intelligence & Cognitive Science, September 2004.