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RE: Negative mass of substances, which pushed back in front!
I don't have the exact scientific publication you are referring to (you may add that to the post by the way), but if I remember well, the study you are mentioning, the mass is not negative but the system is behaving like the mass would be effectively negative. The word 'effective' is very important :)
EDIT: actually I found this and the references in there. I was right ;)