@BOOK{Lamport,
            Title          = {{LaTeX}: A Document Preparation System},
            AUTHOR         = {Lamport, Leslie},
            PUBLISHER      = {Addison-Wesley},
            ADDRESS        = {Reading Massachusetts},
            YEAR           = {1994},
            Keywords       = {Latex documentation}
}
@BOOK{Goossens,
            Title          = {The {LaTeX} Companion},
            AUTHOR         = {Gossens, Michael and Mittelbach, Frank and Samarin, Alexander},
            PUBLISHER      = {Addison-Wesley},
            ADDRESS        = {Reading Massachusetts},
            YEAR           = {1994},
            Keywords       = {Latex documentation}
}