@article {1991,
	title = {Shape optimization for Dirichlet problems: relaxed formulations and optimally conditions},
	journal = {Appl.Math.Optim. 23 (1991), no.1, p. 17-49.},
	number = {SISSA;124/89/M},
	year = {1991},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/880},
	author = {Giuseppe Buttazzo and Gianni Dal Maso}
}
@article {1990,
	title = {Shape optimization for Dirichlet problems: relaxed solutions and optimality conditions},
	journal = {Bull. Amer. Math. Soc. (N.S.) , 23 (1990), no.2, 531-535.},
	number = {SISSA;49/89/M},
	year = {1990},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/809},
	author = {Giuseppe Buttazzo and Gianni Dal Maso}
}
@article {1986,
	title = {Dirichlet problems for demicoercive functionals},
	journal = {Nonlinear anal. 10(1986), no.6, 603-613},
	number = {SISSA;03/85/M},
	year = {1986},
	publisher = {SISSA Library},
	doi = {10.1016/0362-546X(86)90145-8},
	url = {http://hdl.handle.net/1963/390},
	author = {Gabriele Anzellotti and Giuseppe Buttazzo and Gianni Dal Maso}
}
