On the mathematical theory of isomers. Cayley, A. Philos Mag, Series 4, 47(314):444–447, Taylor & Francis, 1874.
doi  bibtex   
@Article{cayley74mathematical,
  author    = {Arthur Cayley},
  title     = {On the mathematical theory of isomers},
  journal   = {Philos Mag, Series 4},
  year      = {1874},
  volume    = {47},
  number    = {314},
  pages     = {444--447},
  issn      = {1941-5982},
  comment   = {counting trees with degree 4},
  doi       = {10.1080/14786447408641058},
  file      = {Cayley_MathematicalTheoryIsomers_PhilosophicalMagazine_1874.pdf:1874/Cayley_MathematicalTheoryIsomers_PhilosophicalMagazine_1874.pdf:PDF},
  owner     = {Sebastian},
  publisher = {Taylor \& Francis},
  timestamp = {2009.08.19},
}

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