The edge versus path incidence matrix of series parallel graphs and greedy packing. Hoffman, A. & Schieber, B. Discrete Mathematics, 113:275–284, 2001.
bibtex   
@ARTICLE{J48,
  AUTHOR = {Hoffman, A.J. and Schieber, B.},
  YEAR = {2001},
  JOURNAL = {Discrete Mathematics},
  PAGES = {275--284},
  TITLE = {The edge versus path incidence matrix of series parallel graphs and greedy packing},
  VOLUME = {113},
}

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