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    Feldmann, Andreas Emil, Könemann, Jochen, Olver, Neil 
ORCID: 0000-0001-8897-5459 and Sanitàa, Laura 
  
(2016)
On the equivalence of the bidirected and hypergraphic relaxations for Steiner tree.
    Mathematical Programming, 160 (1-2).
     379 - 406.
     ISSN 0025-5610
  
  
    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
  
  
    Feldmann, Andreas Emil, Könemann, Jochen, Olver, Neil 
ORCID: 0000-0001-8897-5459 and Sanitàa, Laura 
  
(2014)
On the equivalence of the bidirected and hypergraphic relaxations for Steiner tree.
    In: 17th. International Workshop on Approximation Algorithms for Combinatorial Optimization Problems: Random-Approx 2014, 2014-09-04 - 2014-09-06, Universitat Politècnica de Catalunya (UPC), Barcelona, Spain, ESP.