@BOOK{mittelbach04,
   author = {Frank Mittelbach and Michel Goossens},
   editor = {},
   title = {The LaTeX Companion},
   publisher = {Addison Wesley},
   year = {2004},
   volume = {},
   number = {},
   series = {},
   address = {Boston},
   edition = {},
   month = {},
}
@BOOK{kopka04,
   author = {Helmut Kopka and Patrick W. Daly},
   editor = {},
   title = {Guide to LaTeX},
   publisher = {Addison Wesley},
   year = {2004},
   volume = {},
   number = {},
   series = {},
   address = {Boston},
   edition = {},
   month = {},
}
@BOOK{gratzer00,
   author = {George Gr\"{a}tzer},
   editor = {},
   title = {Math into LaTeX},
   publisher = {Birkh\"{a}user},
   year = {2000},
   volume = {},
   number = {},
   series = {},
   address = {New York},
   edition = {},
   month = {},
}