@article{IM_1987__88_143469,
     author = {K. Altmann},
     title = {Equisingular deformations of isolated 2-dimensional hyper-surface singularities.},
     journal = {Inventiones mathematicae},
     pages = {619--634},
     publisher = {mathdoc},
     volume = {88},
     year = {1987},
     zbl = {0635.14003},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__88_143469/}
}