@article{MM2_1991__70_1_155588,
     author = {Mitsuhiro Miyazaki},
     title = {Some remarks on normal property of graded subalgebras of polynomial rings.},
     journal = {Manuscripta mathematica},
     pages = {267--278},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1991},
     zbl = {0724.13001},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155588/}
}