B. Helena

Temporal evolution of groundwater composition in an alluvial aquifer (Pisuerga river, Spain) by Principal Component Analysis.

B. Helena, R. Pardo, M. Vega, 2000 .

A Case of Hydrochemical Characterization of an Alluvial Aquifer Influenced by Human Activities

B. Helena, R. Pardo, M. Vega, 1999 .

Application of two- and three-way principal component analysis to the interpretation of chemical fractionation results obtained by the use of the B.C.R. procedure

B. Helena, R. Pardo, M. Vega, 2004 .