@article{MM2_1994__84_1_155992,
     author = {Uwe Nagel and Yves Pitteloud},
     title = {On graded {Bett} numbers and geometrical properties of projective varieties.},
     journal = {Manuscripta mathematica},
     pages = {291--314},
     publisher = {mathdoc},
     volume = {84},
     number = {1},
     year = {1994},
     zbl = {0837.14016},
     url = {http://geodesic.mathdoc.fr/item/MM2_1994__84_1_155992/}
}