@article{LetchfordPokuttaSchulz, author = {Letchford, A.N. and Pokutta, Sebastian and Schulz, A.S.}, title = {On the membership problem for the 0,1/2-closure}, series = {Operations Research Letters}, volume = {39}, journal = {Operations Research Letters}, number = {5}, pages = {301 -- 304}, language = {en} }