@article{IM_1995__120_2_144278,
     author = {Jun-Muk Hwang},
     title = {Nondeformability of the complex hyperquadric.},
     journal = {Inventiones mathematicae},
     pages = {317--338},
     publisher = {mathdoc},
     volume = {120},
     number = {2},
     year = {1995},
     zbl = {0846.32021},
     url = {http://geodesic.mathdoc.fr/item/IM_1995__120_2_144278/}
}