@article {2002,
	title = {Local calibrations for minimizers of the Mumford-Shah functional with a triple junction},
	journal = {Commun. Contemp. Math. 4 (2002) 297-326},
	number = {SISSA;39/2001/M},
	year = {2002},
	publisher = {World Scientific},
	abstract = {We prove that, if u is a function satisfying all Euler conditions for the Mumford-Shah functional and the discontinuity set of u is given by three line segments meeting at the origin with equal angles, then there exists a neighbourhood U of the origin such that u is a minimizer of the Mumford-Shah functional on U with respect to its own boundary conditions on the boundary of U. The proof is obtained by using the calibration method.},
	doi = {10.1142/S0219199702000646},
	url = {http://hdl.handle.net/1963/3050},
	author = {Maria Giovanna Mora}
}
