@book{13561,
	author = {Gaines, Robert E. and Mawhin, Jean L. and Mawhin, Jean L. ; jt. auth.},
	title = {Coincidence degree and nonlinear differential equations},
	publisher = {Springer-Verlag},
	year = {1977},
	series = {Lecture notes in Mathematics},
	address = {Berlin}
}