@book{Janer-GIA-2009,
  	year = {2009},
  	author = {Janert, Philipp K.},
  	isbn = {1933988398},
  	publisher = {Manning Publications Co.},
  	title = {Gnuplot in Action	}
  }
  
  @book{Raymond-TAO-2003,
  	publisher = {Addison Wesley},
  	year = {2003},
  	title = {The art of Unix Programming	},
  	author = {Raymond, Eric S.}
  }