On the Directed Degree-Preserving Spanning Tree Problem. Lokshtanov, D., Raman, V., Saurabh, S., & Sikdar, S. In Proceedings of International Workshop on Parameterized and Exact Computation (IWPEC), pages 276-287, 2009.
On the Directed Degree-Preserving Spanning Tree Problem [link]Paper  bibtex   
@inproceedings{ dblp3221241,
  title = {On the Directed Degree-Preserving Spanning Tree Problem},
  author = {Daniel Lokshtanov and Venkatesh Raman and Saket Saurabh and Somnath Sikdar},
  author_short = {Lokshtanov, D. and Raman, V. and Saurabh, S. and Sikdar, S.},
  bibtype = {inproceedings},
  type = {inproceedings},
  year = {2009},
  key = {dblp3221241},
  id = {dblp3221241},
  biburl = {http://www.dblp.org/rec/bibtex/conf/iwpec/LokshtanovRSS09},
  url = {http://dx.doi.org/10.1007/978-3-642-11269-0_23},
  conference = {IWPEC},
  pages = {276-287},
  text = {IWPEC 2009:276-287},
  booktitle = {Proceedings of International Workshop on Parameterized and Exact Computation (IWPEC)}
}

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