Sub-Coloring and Hypo-Coloring Interval Graphs. Gandhi, R., Greening, B., Pemmaraju, S. V., & Raman, R. Discret. Math. Algorithms Appl., 2(3):331–346, 2010.
Sub-Coloring and Hypo-Coloring Interval Graphs [link]Paper  doi  bibtex   
@article{DBLP:journals/dmaa/GandhiGPR10,
  author       = {Rajiv Gandhi and
                  Bradford Greening and
                  Sriram V. Pemmaraju and
                  Rajiv Raman},
  title        = {Sub-Coloring and Hypo-Coloring Interval Graphs},
  journal      = {Discret. Math. Algorithms Appl.},
  volume       = {2},
  number       = {3},
  pages        = {331--346},
  year         = {2010},
  url          = {https://doi.org/10.1142/S1793830910000693},
  doi          = {10.1142/S1793830910000693},
  timestamp    = {Mon, 17 Aug 2020 01:00:00 +0200},
  biburl       = {https://dblp.org/rec/journals/dmaa/GandhiGPR10.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}

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