@InProceedings{DS08,
    Author       = "Desharnais, J. and Struth, G.",
    Year         = "2008",
    Title        = "{Modal Semirings Revisited}",
    Editor       = "Audebaud, P. and Paulin-Mohring, C.",
    BookTitle    = "{Proceedings of the 9th International Conference on the
                    Mathematics of Program Construction}",
    Place        = "Marseille, France",
    Series       = "Lecture Notes in Computer Science",
    Number       = "5133",
    Pages        = "360-387",
    Publisher    = "Springer-Verlag",
    Comment      = "TPTPRef"
}