http://www.xtec.cat/~jgenover/cindir1.htm
http://www.google.es/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CGQQFjAA&url=http%3A%2F%2Ffaculty.mansfield.edu%2Fwkeeth%2FLos%2520complementos%2520indirectos.ppt&ei=0kWyT6jrN-HH0QXKmsWjDQ&usg=AFQjCNEQgTaTsGrB9T32gugnbD6heBZypQ&sig2=lVE-bJKvyrjoOPM1NskpgA
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