Open-Shop Unions and Product Market Competition
Paulo Bastos, Udo Kreickemeier, Peter Wright
Canadian Journal Of Economics, vol. 43, 2010, p. 640-662.

Oligopoly, Open Shop Unions and Trade Liberalisation
Paulo Bastos, Udo Kreickemeier, Peter Wright
International Journal of Industrial Organization, vol. 27, 2009, p. 679-686.

Unions, Competition and International Trade in General Equilibrium
Paulo Bastos, Udo Kreickemeier
Journal of International Economics, vol. 79, 2009, p. 238-247.