Il 13º uomo

I can't say this film is my most favorite in the cinema history. But definitely i can say-this movie is number one in my most wanted list. I never was so depressed and unlucky, as searching for this old and very nice french film by Costa-Gavras. I failed to find this film. I heard this film is lost. Strange. It was showed in many countries and i still hope. Maybe in some country, some people or organizations still have a copy of it. This is one of the best films by Costa-Cavras. And one of the best war thrillers of all time. I would be more then grateful, if anybody can tell any link, any tips or idea: where and how to find and see this movie again.