@article {852,
	title = {Initial segments maximal Σₙ-definable sets in fragments of arithmetic},
	journal = {Joint Conference of the 5th Barcelona Logic Meeting and the 6th Kurt G{\"o}del Colloquium},
	volume = {IV},
	year = {2001},
	month = {16-19/07/1999},
	pages = {37-38},
	publisher = {Kurt G ̈del Society},
	address = {Barcelona (Spain)},
	author = {Carmen Graciani-D{\'\i}az and Mario J. P{\'e}rez-Jim{\'e}nez and {\'A}lvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini}
}
