@article {1988,
	title = {Holes and obstacles},
	journal = {Ann. Inst. H. Poincare Anal. Non Lineaire  5  (1988),  no. 4, 323-345},
	number = {SISSA;20/87/M},
	year = {1988},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/501},
	author = {Roberta Musina and Giovanni Mancini}
}
