As part of a European 5th Framework project PURE (Protection of Underground REsources), a specific market-oriented research task was undertaken by the British 
service provider VHE, mainly 2001-3.   
  
Two conference papers from this work have recently been uploaded to EUGRIS (see below). 
       

       Stratford Paper 56.8 KB (PDF)
       

       

       Cardiff Paper 50KB (PDF)