@book{21655,
	author = {Benest, Daniel, ed. and Froeschle, Claude, ed.},
	title = {Singularities in Gravitational Systems},
	publisher = {Springer Berlin Heidelberg},
	year = {2002},
	series = {Lecture Notes in Physics},
	address = {Heidelberg, Berlin},
	url = {http://doi.org/10.1007/3-540-48009-9}
}