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Line 6: and quantum many-particle systems, obtained via the [[Hubbard-Stratonovich transformation]] (Baeurle 2002, Baeurle 2007, Schmid 1998, Baer 1998), as well as in real-time Feynman [[path integral]] quantum dynamics (Makri 1987, Miller 2005). In case of field theories the difficulty relates to the oscillatory nature of the weight function in specific parameter ranges, resulting from strong repulsive forces between the particles (Baeurle 2004).

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