%0 Journal Article %A Nikolai Kitanine %A Giridhar Kulkarni %T Form Factors of the Heisenberg Spin Chain in the Thermodynamic Limit: Dealing with Complex Bethe Roots %J Symmetry, integrability and geometry: methods and applications %D 2021 %V 17 %U http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a111/ %G en %F SIGMA_2021_17_a111