4 IZA Discussion Papers
IZA Discussion Paper No. 14654
IZA Discussion Paper No. 13867
IZA Discussion Paper No. 8891
published in: Philippe Askenazy, Lutz Bellmann, Alex Bryson, and Eva Moreno Galbis (eds.), Productivity Puzzles Across Europe, Oxford University Press, 2016, ISBN: 9780198786160, Chapter 8,
IZA Discussion Paper No. 8540
published in: British Journal of Industrial Relations, 2021, 59(2), 335–369