{HEAD ~ Processing aids} to improve the bitumen recovery and froth {TAIL ~ quality} in oil sands extraction processes 
{ HEAD ~ Processing aids } to improve the bitumen recovery and froth { TAIL ~ quality } in oil sands extraction processes
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH