Jørgen Bang-Jensen, Anders Yeo. The minimum spanning strong subdigraph problem is fixed parameter tractable. Discrete Applied Mathematics, 156(15):2924-2929, 2008. [doi]
@article{Bang-JensenY08, title = {The minimum spanning strong subdigraph problem is fixed parameter tractable}, author = {Jørgen Bang-Jensen and Anders Yeo}, year = {2008}, doi = {10.1016/j.dam.2007.12.003}, url = {http://dx.doi.org/10.1016/j.dam.2007.12.003}, researchr = {https://researchr.org/publication/Bang-JensenY08}, cites = {0}, citedby = {0}, journal = {Discrete Applied Mathematics}, volume = {156}, number = {15}, pages = {2924-2929}, }