@conference {109, title = {Ultrasonic pattern recognition based on ANN and PCA techniques}, booktitle = {IEEE International Symposium on Industrial Electronics (ISIE{\textasciiacute}05)}, year = {2005}, month = {06/2005}, pages = {1}, address = {Dubrovnik, Croatia}, isbn = {0-7803-8739-2}, author = {Alberto Ochoa and {\'A}lvaro Hern{\'a}ndez and Ure{\~n}a, J. and Manuel Mazo and Jose Antonio Jimenez and J.J. Garcia and Ana Jimenez} }