@article {2013,
	title = {Quadratic cohomology},
	year = {2013},
	note = {24 pages},
	publisher = {SISSA},
	abstract = {We study homological invariants of smooth families of real quadratic forms as\r\na step towards a \"Lagrange multipliers rule in the large\" that intends to\r\ndescribe topology of smooth vector functions in terms of scalar Lagrange\r\nfunctions.},
	author = {Andrei A. Agrachev}
}
