Wage Bargaining and Employment Revisited: Separability and Efficiency in Collective Bargaining
C.-J. Haake, T. Upmann, P. Duman, Scandinavian Journal of Economics 125 (2022) 403–440.

The Decomposability of the Nash Bargaining Solution in Labor Markets
C.-J. Haake, T. Upmann, P. Duman, The Decomposability of the Nash Bargaining Solution in Labor Markets, CIE Working Paper Series, Paderborn University, 2019.