@article{MM2_1993__79_1_155847,
     author = {Manfred Herrmann and J. Ribbe and Eero Hyry},
     title = {On the {Cohen-Macaulay} and {Gorenstein} properties of multigrad rees algebras.},
     journal = {Manuscripta mathematica},
     pages = {343--378},
     publisher = {mathdoc},
     volume = {79},
     number = {1},
     year = {1993},
     zbl = {0796.13003},
     url = {http://geodesic.mathdoc.fr/item/MM2_1993__79_1_155847/}
}