TY - JOUR T1 - Lehman's Theorem and the Directed Steiner Tree Problem JO - SIAM Journal on Discrete Mathematics UR - http://dx.doi.org/10.1137/15m1007185 PY - 2016/01/14 AU - Abdi A AU - Feldmann AE AU - Guenin B AU - Könemann J AU - Sanità L ED - DO - DOI: 10.1137/15m1007185 PB - Society for Industrial & Applied Mathematics (SIAM) VL - 30 IS - 1 SP - 141 EP - 153 Y2 - 2024/12/22 ER -