@article{baez,
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  year = "2002",
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}

@book{ebbinghaus,
  author = {H.-D. Ebbinghaus et al. (eds.)},
  title = {Numbers},
  edition = {},
  publisher = {Springer},
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  year = {1991}
} 

@book{lounesto,
  author = {Pertti Lounesto},
  title = {Clifford Algebras and Spinors},
  edition = {2},
  publisher = {Cambridge University Press},
  year = {2001}
} 
