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Abdi, Ahmad ORCID: 0000-0002-3008-4167, Feldmann, Andreas Emil, Guenin, Bertrand, Könemann, Jochen and Sanita, Laura (2016) Lehman's theorem and the directed Steiner tree problem. SIAM Journal on Discrete Mathematics, 30 (1). pp. 141-153. ISSN 0895-4801