@conference {HaKa02,
	title = {XML Semantics},
	booktitle = {Conference of PhD Students in Computer Science},
	year = {2002},
	pages = {43},
	author = {F. Havasi and M. K{\'a}lm{\'a}n}
}
@article {Havasi02,
	title = {{XML} Semantics Extension},
	journal = {Acta Cybernetica},
	volume = {15},
	year = {2002},
	pages = {509-528},
	author = {F. Havasi}
}
@conference {Havasi01,
	title = {XML Semantics Extensions},
	booktitle = {Proceedings of Seventh Symposium on Programming Languages and Software Tools},
	year = {2001},
	pages = {198-211},
	author = {F. Havasi}
}
