@ARTICLE{einstein,
	author    = "Albert Einstein",
	year      = 1911,
	journal   = "Wied. Ann.",
	volume    = 35,
	pages     = "898--908"}

@BOOK{Lamport,
	author    = "Leslie Lamport",
	title     = "{\LaTeX} Users Guide and Reference Manual",
	year	  = 1994,
	publisher = "Addison-Wesley"
      }

@BOOK{Gratzer,
	author    ="George Gr{\"a}tzer",
        title     = "Math Into {\LaTeX}",
        year      = 2000,
        publisher = "BirkH{\"a}user"
      }