Recursions, formulas, and graph-theoretic interpretations of ramified coverings of the sphere by surfaces of genus 0 and 1. Vakil, R. arXiv:math/9812105, 1998.
bibtex   
@Article{	  vak:98,
  archiveprefix	= {arXiv},
  author	= {Ravi Vakil},
  date		= {1998-12-17},
  eprint	= {math/9812105},
  eprinttype	= {arxiv},
  hyphenation	= {american},
  journal	= {arXiv:math/9812105},
  title		= {Recursions, formulas, and graph-theoretic interpretations
		  of ramified coverings of the sphere by surfaces of genus 0
		  and 1},
  year		= 1998
}

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