@article{IM_1989__97_2_143709,
     author = {N.I. Shepherd-Barron},
     title = {Apolarity and its applications.},
     journal = {Inventiones mathematicae},
     pages = {433--444},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {1989},
     zbl = {0709.14027},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__97_2_143709/}
}