@ARTICLE{Almeida04:5,
  author = {Almeida, Jos{\'e} B.},
  year = 2005,
  title = {Wavefront and Ray-Density Plots Using Seventh-Order Matrices},
  journal = {Optik},
  volume = 116,
  number = 5,
  pages = {195--200},
  comment = {Indexed},
  eprint = {physics/0410055}
}

@INPROCEEDINGS{Almeida04:4,
  author = {Almeida, Jos{\'e} B.},
  year = 2004,
  title = {The Null Subspace of {G}(4,1) as Source of the Main Physical
          Theories},
  booktitle = {Physical Interpretations of Relativity Theory -- {IX}},
  address = {London},
  eprint = {physics/0410035}
}

@BOOK{Doran03,
  author = {Doran, Chris and Lasenby, Antony},
  year = 2003,
  title = {Geometric Algebra for Physicists},
  publisher = {Cambridge University Press},
  address = {Cambridge, U.K.}
}

@INPROCEEDINGS{Franco05,
  author = {S. Franco AND J. B. Ameida AND M. Parafita},
  editor = {A. Garg AND J. E. Hoyos AND D. Dementiev},
  year = 2005,
  title = {Optical Corneal Tomography},
  booktitle = {Mastering the Techniques of {IOL} Power Calculations},
  pages = {46--50},
  ISBN = {81-8061-539-1},
  publisher = {Jaypee Brothers Medical Publishers},
  address = {New Delhi}
}