Hello Ruxandra,Maybe these ...

Published February 4, 2013 02:35 by Boris Hiro LHIE, Engineer in Plant Protection and Environment

Hello Ruxandra, Maybe these short clip can help you a bit: http://www.youtube.com/watch?v=BQx5ab-zwXg http://www.youtube.com/watch?v=w9RxnuBiFbg Cheers,