Revisiting the world technology frontier: a directional distance function approach
Crossref DOI link: https://doi.org/10.1007/s10887-016-9136-5
Published Online: 2016-09-02
Published Print: 2017-03
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Krüger, Jens J.
License valid from 2016-09-02