@book{12401,
	author = {Gerard, R. and Ramis, J. P. , ed. and Ramis, J. P. ; jt. ed.},
	title = {Equations differentielles et systemes de pfaff dans le champ complexes},
	publisher = {Springer-Verlag},
	year = {1978},
	series = {Lecture notes in Mathematics},
	address = {Berlin}
}