1.
BLOMSTRÖM M, LIPSEY R, OHLSSON L. What do rich countries trade with each other? R&D and the composition of U.S. and Swedish trade. PSL QR [Internet]. 2013 Oct. 22 [cited 2024 Nov. 22];43(173). Available from: https://rosa.uniroma1.it/rosa04/psl_quarterly_review/article/view/10931