@article{MM2_1997__94_2_156331,
     author = {Tomohiro Okuma},
     title = {The plurigenera of {Gorenstein} surface singularities.},
     journal = {Manuscripta mathematica},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {1997},
     zbl = {0902.14025},
     url = {http://geodesic.mathdoc.fr/item/MM2_1997__94_2_156331/}
}